The planets in our solar system are thought to have come from

Chapter 6: Mastering Astronomy Flashcards Quizle

the planets in our solar system are thought to have come from a) clumps of rocky material that exist between stars b) the same cloud of gas and dust in which the sun formed c) the sun (they were flung out from the spinning sun 1. The planets in our solar system are thought to have come from - the same cloud of gas and dust in which the Sun formed. 2. As the solar nebula collapsed, it became a disk because-collisions between particles made the particles go in more-or-less the same direction. 3. The inner planets are small and rocky and the outer planets are mostly large and gaseous because - hydrogen compounds are. Answer: 2 question The planets in our solar system are thought to have come from - the answers to estudyassistant.co Introduction. The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy. Our solar system consists of our star, the Sun, and everything bound to it by gravity — the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, dwarf planets such as Pluto, dozens of moons and millions of asteroids, comets and meteoroids The planets in our solar system are thought to have come from The same cloud of gas and dust in which the sun formed As the solar nebula collapsed, it became a disk because The overall rotation of the nebula plus collisions between particles made the particles go in more or less the same directio

Lesson 4 hw.docx - 1 The planets in our solar system are ..

  1. Competing theories on the origin of the Solar System By the mid-1700s, French mathematician Georges-Louis Leclerc was suggesting that the planets formed when a comet struck the Sun, sending vast amounts of material surging outwards. Over time, he said, gravity collected this material together to form orbiting worlds
  2. However, the planets moved relative to the stars. For this reason they were called wandering stars. Our word planet comes from the Greek word planetes, meaning wanderer. Planets As Gods. To the people of many ancient civilizations, the planets were thought to be deities. Our names for the planets are the Roman names for these deities
  3. Andrew Cohen and Professor Brian Cox take readers on a voyage of discovery, from the fiery heart of our Solar System, to its mysterious outer reaches. They touch on the latest discoveries that have expanded our knowledge of the planets, their moons and how they come to be. Product Details. ISBN: 9780008280574
  4. A star that hosts planets orbiting around it is called a planetary system, or a stellar system, if more than two stars are present. Our planetary system is called the Solar System, referencing the name of our Sun, and it hosts eight planets.. The eight planets in our Solar System, in order from the Sun, are the four terrestrial planets Mercury, Venus, Earth, and Mars, followed by the two gas.
  5. Defining the term planet is important, because such definitions reflect our understanding of the origins, architecture, and evolution of our solar system. Over historical time, objects categorized as planets have changed. The ancient Greeks counted the Earth's Moon and Sun as planets along with Mercury, Venus, Mars, Jupiter, and Saturn
  6. The planets in our solar system are thought to have come from: The same cloud of gas and dust in which the sun formed. As the solar nebula collapsed, it became a disk because: The overall rotation of the nebula plus collisions between particles made the particles go in more or less the same direction

The planets in our solar system are thought to have come fro

  1. C/2002 F3 (Neowise) is thought to have come from one of the least explored and most mysterious parts of our solar system - the vast, frozen Oort Cloud. It is found in the furthest reaches of the.
  2. The rocky, terrestrial planets — Mercury, Venus, Earth, and Mars — all formed in the inner, hotter part of our Solar System. It was so hot that volatile materials — materials that evaporate easily at normal temperatures and pressures — could not condense
  3. Most geologists think Earth's atmosphere and oceans arrived about 4bn years ago - the product of multiple volcanic burps. Alternatively, they may have come from comets colliding with Earth and..
  4. Introduction. So far scientists have categorized exoplanets into the following types: Gas giant, Neptunian, super-Earth and terrestrial. The planets beyond our solar system are called exoplanets, and they come in a wide variety of sizes, from gas giants larger than Jupiter to small, rocky planets about as big around as Earth or Mars
  5. Ceres. Ceres is the very first dwarf planet to be discovered, though its official classification as such wouldn't come until 2006. It's is the largest object in the asteroid belt and accounts for nearly a third of its mass, but is still the smallest known dwarf planet in our solar system
  6. The Kepler-20 system includes three other planets that are larger than Earth but smaller than Neptune. Kepler-20b, the closest planet, Kepler-20c, the third planet, and Kepler-20d, the fifth planet, orbit their star every 3.7, 10.9 and 77.6 days. All five planets have orbits lying roughly within Mercury's orbit in our solar system

So there we have it, our perception of the solar system has of course changed over time, whether it's comprised of 8 or 9 planets just to be begin with. Whatever number though, each planet has an incredible tale, and at some point, the visible planets at the very least, have been held very highly in cultures across the world and in mythology A: People have hypothesized that they come from something called the Oort cloud. This is a big, almost spherical cloud of objects at the very edge of our Solar System. It's thought to have formed a.. Astronomically, bodies within the Solar System must achieve three criteria in order to gain the much-vaunted status of planet: Gravitationally pull themselves into a spheroidal shape, where they.. If the definition is approved by the astronomers gathered 14-25 August 2006 at the IAU General Assembly in Prague, our Solar System will include 12 planets, with more to come: eight classical. For the first time, eight planets have been found orbiting another star, tying with our solar system for the most known planets around a single star. The Kepler-90 system is in the constellation.

Red dwarf passed within just 0

In Depth Our Solar System - NASA Solar System Exploratio

Visitors from the Edge of our Solar System. Estonian philosopher Ernst Öpik first theorized that long-period comets might come from an area at the edge of our solar system. Then, Dutch astronomer Jan Oort predicted the existence of his cloud in the 1950s to better understand the paradox of long-period comets Scientists for the first time have spotted a moon-forming region around a planet beyond our solar system - a Jupiter-like world surrounded by a disk of gas and dust massive enough that it could spawn three moons the size of the one orbiting Earth. The researchers used the ALMA observatory in Chile's Atacama desert to detect the disk of swirling material accumulating around one of two newborn. If there are a bunch of dwarf planets lurking in the outer Solar System—and even Planet Nine itself—the VRO could find them. That would make the second Sun theory more likely to be.

In our solar system, the large gas giant planets are far from the sun and the small rocky planets are close to the sun. Planetary scientists have developed models of how this might have happened, and those theories indicate that the large gas giant planets ought to be far from the sun, as is the case in the solar system The various planets are thought to have formed from the solar nebula, the disc-shaped cloud of gas and dust left over from the Sun's formation. The currently accepted method by which the planets formed is accretion, in which the planets began as dust grains in orbit around the central protostar 1. The planets in our solar system are thought to have come from . a. clumps of rocky material that exist between the stars. b. the same cloud of gas and dust in which the Sun formed. c. a cloud of gas in the Orion nebula. d. the Sun (they were flung out of the fast-spinning young sun) 2. As the solar nebula collapsed, it became a disk becaus

The planets in our solar system never line up in one perfectly straight line like they show in the movies. If you look at a two-dimensional plot of the planets and their orbits on a piece of paper you may be lead to believe that all the planets will circle around to the same line eventually. The closest the eight planets will come to being. A cloud of gas and dust began to collapse 4.6 billion years ago, triggering the formation of Earth's sun and solar system. Pictured here: a much larger collection of gas and dust, spotted in the. The largest planets in our solar system could have drifted away from the sun much sooner than scientists previously thought, a new study suggests. Understanding this phenomenon could help. The planets in order from the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and finally the dwarf planet Pluto.. Most people have at least heard about our solar system and the planets in it. Our solar system is usually gone over in elementary school, so you might just need a refresher course about the planets in order in our solar system

Now astronomers have found a distant solar system with its own Planet Nine, and that discovery is breathing new life into the hypothesis. The planet is named HD 106906 b, and it orbits a binary. Where They Come From: the short-period comets are thought to have originated in and Hyakutake pass by Earth on a predictable basis much in the same way as the planets in our solar system. Beyond the warm worlds of the inner solar system, beyond the gas giant Jupiter, in the freezing region far beyond the sun, lies Saturn, a planet made unique thanks to a nearly 45,000-mile-wide.

The beginnings of a planetary system, including our own, are thought to be quite messy. As planets swirl into shape out of the cosmic fog surrounding a newborn star, they jostle one another around Jupiter. After the Sun, Jupiter has by far the strongest and biggest magnetic field in our solar system — it stretches about 12 million miles from east to west, almost 15 times the width of the Sun. (Earth's, on the other hand, could easily fit inside the Sun — except for its outstretched tail.) Jupiter does not have a molten metal core; instead, its magnetic field is created by a core.

Inner solar system bodies are rocky, unlike the gas and water giant planets of the outer solar system. Rocky planets Mercury, Venus, Earth and Mars are thought to have formed from the accretion of dust into planetismals, the planetismals into proto-planets and finally the proto-planets into planets Solar System History 101. Our solar system is a wondrous place. Countless worlds lie spread across billions of kilometers of space, each dragged around the galaxy by our Sun like an elaborate clockwork. The smaller, inner planets are rocky, and at least one has life on it. The giant outer planets are shrouded in gas and ice; miniature solar. Instead, this dwarf planet takes a bizarre and unexpected path, swinging from just 76 Earth-Sun distances (roughly 11 billion k/7 billion miles) from the centre of our solar system to more than.

Though the planets in our solar system circle just one star -- our sun -- other more distant planets, called exoplanets, can be reared in families with two or more stars. Researchers wanting to know more about the complex influences of multiple stars on planets have come up with two new case studies: a planet found to have three parents, and. Andrew Cohen and Professor Brian Cox take readers on a voyage of discovery, from the fiery heart of our Solar System, to its mysterious outer reaches. They touch on the latest discoveries that have expanded our knowledge of the planets, their moons and how they come to be, alongside recent stunning and mind-boggling NASA photography Our solar system is filled with a wide assortment of celestial bodies - the Sun itself, our eight planets, dwarf planets, and asteroids - and on Earth, life itself! The inner solar system is occasionally visited by comets that loop in from the outer reaches of the solar system on highly elliptical orbits.In the outer reaches of the solar system, we find the Kuiper Belt and the Oort cloud And it is doing so for our benefit. Thus, the gods caused the solar system — and ourselves — to come into existence long, long ago. The first incarnation of the solar system is called, in occult science, Old Saturn. It has been given this name because the forces associated with Saturn were predominant throughout the solar system at that time

Earth Space & Science Review Flashcards Quizle

  1. Our Solar System is part of the Milky Way galaxy. Galaxies are big mixes of dust, gas, stars, and other things. Inside our Milky Way galaxy are clouds of dust and gas where stars are born. Our Solar System was created in this kind of cloud. A part of the cloud began to get smaller and less spread out
  2. The most commonly known planets are the eight that make up our solar system: Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, and Mercury. However, there are many more planets that exist outside of our solar system. Astronomers have come up with many criteria they use to classify these planets, one criterion is classifying the planets.
  3. Solar System Facts. The solar system consists of the Sun; the eight official planets, at least three dwarf planets, more than 130 satellites of the planets, a large number of small bodies (the comets and asteroids), and the interplanetary medium. (There are probably also many more planetary satellites that have not yet been discovered.
  4. Since they have undergone little change since the beginning of the solar system, comets are thought to contain fairly pristine samples of the materials that formed the primordial nebula. So studying them is a good way to glimpse the original cloud of gas and dust from which the Sun and planets formed
  5. A simple way to compare the sizes of our solar system's planets, the sun and the moon. You can compare them side by side or with the smaller object positioned on the surface of the larger one. Press the left button and move the mouse to rotate. After you have selected two objects, double click the left button anywhere on the larger one and the.
  6. The outer solar system, where Pluto resides, is the new frontier for exploration. Astronomers have been finding other worlds out there, in regions such as the Kuiper Belt and the Inner Oort Cloud. Many of those worlds, such as Eris, Haumea, Makemake, and Sedna, have been deemed dwarf planets as well. In 2014, a tiny planetesimal called 2014.
Anunnaki and Nibiru: The Origins of Civilization

Examining the water worlds of the solar system. Credit: NASA. Here is a look at the top 10 most likely places to find life in our solar system, the local water worlds (and one really cool carbon. HM-TECH Glow Solar System Wall Stickers Set. Our mission is to create beautiful, calming spaces and happy memories for our customers. When you buy HM-TECH products you know you are getting the high quality. The stickers reveal spectacular colors during the day and just like real stars and planets, glow at night creating a beautiful, relaxing and inspiring atmosphere Asteroids that orbit the sun on paths that take them between the giant planets - Jupiter, Saturn, Uranus and Neptune - are known as centaurs, and it is thought that many might come from.

Putting the Sun at the center of our Solar System, other astronomers began to realize, simplified the orbits for the planets. And it helped explain what was so weird about Mars Maybe life can find a foothold in systems where these giants are not quite so placid after all. Jupiter, a vast gas ball less than a light hour from us, dominates the planets of our solar system.

By David L Chandler. How did our solar system, with its many planets and moons, come into being? It was a beautiful, sunny day on the French Riviera, and four astronomers were having lunch at the. Solar System Quotes - BrainyQuote. When you look at the stars and the galaxy, you feel that you are not just from any particular piece of land, but from the solar system. Kalpana Chawla. Space Look Stars. We really have the most beautiful planet in our solar system. None other can sustain life like we know it

The Solar System: How do we know how it formed? - BBC

Our solar system follows a clear pattern. Small, rocky planets close to the Sun, large gas planets farther out, and a belt of astroids between them. On a broad level that would seem to make sense CNN - (CNN) — The two largest planets in our solar system are coming closer together than they have been since the Middle Ages, and it's happening just in time for Christmas -- hence the nickname of the Christmas Star. While it's not an actual star, the two planets will certainly make a bright splash in

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In a major breakthrough, researchers using the Hubble Space Telescope have seen the true color of a planet outside our solar system. HD 189733b, as the gas giant is called, is blue. A deep. Solar System Facts. The solar system is around 4.6 billion years old. At the center of the solar system is the sun, a yellow dwarf star which produces vast amounts of energy. There are eight major planets and over 100 moons in the solar system. Mercury, Venus, Earth and Mars are the small inner rocky planets Harvard scientists have a new take on what wiped out the dinosaurs. The kind of comet that killed T. rex and friends from our planet might be more common than previously thought Evidence shows there is a 9th planet in the far reaches of our solar system. (Planet Nine) has a mass about 10 times that of Earth and orbits about 20 times farther from the sun than Neptune. It would take this new planet between 10,000 and 20,000 years to make just one full orbit around the sun

In our Solar System, only eight worlds make the cut given those criteria. The four rocky planets (Mercury, Venus, Earth, Mars) and the four gas giant worlds (Jupiter, Saturn, Uranus, Neptune) are. How the Solar System was Formed. _ _. A. Gravity pulls the gas and dust of a solar nebula into a protosun (in the center) and protoplanetary disk that begins to spin. B. As the disk rotates, the gas and dust come together into rings and form small rock and ice objects called planetesimals. C The poles of our solar system's ice giants may not even be fixed. The only data we have [are] from a single flyby of both planets by the Voyager II spacecraft in the late '80s, said Stanley The Oört Cloud by the Numbers. The cloud of cometary bodies is widely dispersed through the outermost part of the solar system. It's very distant from us, with an inner boundary 10,000 times the Sun-Earth distance. At its outer edge, the cloud stretches into interplanetary space some 3.2 light-years. For comparison, the closest star to us is.

Video: The Planets - HarperCollin

How Many Planets are in our Solar System? Facts & Amoun

  1. To be more precise, class G stars come in 12 basic variants, our sun being a type G2V. Galaxies have what are thought to be habitable zones. Most stars within a galaxy lay outside the habitable zone. What this means is an exact clone of our solar system would not support life unless it was located within the habitable zone of a galaxy
  2. So the solar system's roll-call returned to eight: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. And a cottage industry of finding distant solar system objects really got going.
  3. The magnetosphere extends so far past Jupiter it sweeps the solar wind as far as the orbit of Saturn. Like Earth's magnetosphere, many of the charged particles trapped in Jupiter's magnetosphere come from the solar wind; however, Jupiter has an extra source of particles that other planets do not have
  4. Our solar system is actually pretty flat, with most of its planets orbiting within three degrees of the plane of the Earth's orbit around the sun, called the ecliptic. This flatness extends to the asteroid belt between Mars and Jupiter, though some members of the region of icy objects past Neptune called the Kuiper belt are more extreme, with.
  5. Although the solar system formed nearly 4.6 billion years ago, researchers have a pretty good record that goes back only 3.9 billion years. Yet those first 700 million years proved critical to all that followed. That's when the planets coalesced and water and other compounds essential to life were delivered to the inner planets
  6. Planet Facts. Our solar system has eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. With the exception of Uranus and Neptune, each of these planets can be seen unaided. All eight planets can be see through the use of an inexpensive amateur telescope or binoculars
  7. The system is thought to be some 12.8 billion years old. Astronomers hope to use this system to begin to understand how and when the first planets formed in our universe

The planets of our solar system were created around 4.6 billion years ago from clumps of rocks spinning around the Sun. water must have come later. It looks like what people thought was. Secondly, as the Solar System orbits the galactic centre, other stars ought to come close enough to perturb the planets' orbits, around once every 23 million years. By accounting for stellar mass loss and the inflation of the outer planet orbits, these encounters will become more influential, the researchers wrote In our model of the solar system, the planets orbit the sun, which in turn orbits around the Northern Hub, Svarrior continued, again bringing us back to the days before 1543 and the Copernican. Ben - This is another great question and the answer is yep, pretty much within a narrow window within the degree of confidence we have in saying a date for any of these things. We're pretty sure that the entire solar system, the sun, the earth, all the planets are something like 4.6 billion years old, again, give or take a few million years

Mystery Of How Gas Giants Formed Could Be Explained By

What is a Planet? Planets - NASA Solar System Exploratio

Since our solar system is roughly 25,000 light years from the galactic center, then our solar system would need to travel around 20,000 light years to get into the more densely-starred inner regions, where, let us suppose [though it isn't] the background radiation level is the equivalent of 1 degree hotter (i.e. the 1 degree hotter that the. Our live Solar System Map - Getting Oriented . If you have our desktop version enabled on your computer, then the application shown above plots the position of the Earth and planets using data from this NASA's JPL website and is accurate between 3000 BCE and 3000 CE. If you have our mobile version enabled then we'll be showing you a simpler. The eight planets in our solar system are, in order from the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.The first four, known as the inner planets, are terrestrial bodies. This means they are rock and metal based planets. When the universe was young, these would have been the only planetary bodies that would have been able to withstand the heat of the young star

What do you understand by the term ‘dwarf planet’? How areJust Right for Life | Answers in Genesis

Astro7N Test1 notes

The composition of planets is affected by the availability of elements around them. This, in turn, is affected by the temperature. The hotter it is, the more elements melt and the faster gas molecules move. During the formation of our solar syst.. From dust clouds to wobbly orbits for new planets. July 30, 2014 4.05pm EDT. New observations of a youthful binary star system, reported today in the journal Nature, may help to explain one of.

Shape of the universe: Could it be curved, not flat?

The mysteries of the icy cloud around our Solar System

The largest planets in our solar system will soon align for the great conjunction — the greatest skywatchers have observed since medieval times. Jupiter and Saturn will come within 0.1. A planetary core consists of the innermost layers of a planet. Cores may be entirely solid or entirely liquid, or a mixture of solid and liquid layers as is the case in the Earth. In the Solar System, core sizes range from about 20% (the Moon) to 85% of a planet's radius ().. Gas giants also have cores, though the composition of these are still a matter of debate and range in possible. The best planet in our solar system is not, that it was originally thought to be a star until Sir William Herschel revealed its planetary nature in 1781. but Uranus's moons come from. You might still think of the solar system as extending out to the orbit of the much-loved dwarf planet Pluto. Today we don't even consider Pluto a full-fledged planet, but the impression remains The Planets and Dwarf Planets. A planet is a large space body which reflects the light of a star around which it revolves.The planets in our solar system are classified as inner planets and outer planets. The inner planets, the closest to the Sun, are solid spheres of rock and include Mercury, Venus, Earth, and Mars

Sky Tellers - Solar Syste

Neptune: The furthest planet from the sun in our solar system. It is the fourth largest planet in the solar system. observatory: (in astronomy) The building or structure (such as a satellite) that houses one or more telescopes. orbit: The curved path of a celestial object or spacecraft around a galaxy, star, planet or moon. One complete circuit. Fly through the Solar System in 3D. Educational. The planets are all relatively scaled based on actual size, orientation, revolutionary speed and angle, rotational speed and angle, and distance from the sun. (Distance and size scales are different though. Otherwise it would be too difficult to find the planets.) By popular demand, I have added. Four the planets in the Solar System have rings. They are the four giant gas planets Jupiter, Saturn, Uranus, and Neptune. Saturn, which has by far the largest ring system, was known to have rings for a long time

Rosetta’s comet 67P is much younger than previously

How did our planet form? Astronomy The Guardia

Active volcanos occur on planets that are still hot. In general, the larger the planet, the slower it cools. Small planets or moons, like Mercury and our Moon, have cooled to the point that they are no longer hot enough to melt rock. Larger planets, like Earth and Venus, are still hot and still have active volcanism Mars is reddish color and some people might have guessed that Mars is the hottest planet in the solar system. But just because it's red, doesn't make it the hottest. Mercury is the planet that is closest to the sun and therefore gets more direct heat, but even it isn't the hottest. Venus is the second planet from the sun and has a. Comets are thought to have formed 4.6 billion years ago, when the solar system was young and just after the planets formed. solutions to puzzles about the nature and evolution of our solar. True or False: There are no planets beyond our solar system (Answer: False. We have observed more than 200 planets beyond our solar system.) True or False: Engineers help us explore the universe by designing telescopes, spectroscopes and spacecraft. (Answer: True) True or False: We cannot send spacecraft into the universe beyond our solar. Pluto is of course the most well known dwarf planet because of its previous classification as the outermost planet of the solar system. Rather like Ceres before it, it has suffered because of the number of similar objects now discovered in the same region mean that it can no longer be thought of as one of the major planets

Overview - Exoplanet Exploration: Planets Beyond our Solar

What's more, this planet naturally explains why the dwarf planets Sedna and Biden have weird orbits that never let them come in close to the solar system. This wasn't something we were setting. Caltech researchers have found evidence of a giant planet tracing a bizarre, highly elongated orbit in the outer solar system. The object, which the researchers have nicknamed Planet Nine, has a mass about 10 times that of Earth and orbits about 20 times farther from the sun on average than does Neptune (which orbits the sun at an average distance of 2.8 billion miles) 10 Hypothetical Planets That Could Exist In Our Solar System. 10 Strange Things Dwell in the Clouds of Venus . The skies of Venus are teeming with strange and elusive things. Scientists say we can learn a lot from the clouds that swarm over our neighboring planet. Astronomers reckon Venus was once a lot like Earth

Comets Can Create and Carry the Building Blocks of Life

Deep Space Spotlight: The Dwarf Planets of our Solar Syste

March 5, 2019. Nasa. When it comes to exploring the solar system, astronomers have an embarrassing secret. Despite 400 years of stargazing, they have discovered only two large objects that would. Most of the planets spin in a counter-clockwise direction (prograde motion) including our Earth. But only two planets, Venus and Uranus spins in clockwise direction (retrograde motion).At this point in life, we should all know the basics of our solar system, namely that there are eight planets that rotate about themselves on an axis in addition to revolving around the sun in an orbit In 1992, astronomers discovered the first exoplanet, or planet outside our solar system. But it didn't come in any form they'd really anticipated. Neutron stars are the second densest type of.

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The movements of planets during the solar system's early period of instability could have resulted in the gravities of Saturn and Jupiter sucking in some material, while sending other asteroids. With Bray Poor, Kevin H. Baines, Todd Barber, Andrew Ingersoll. A travel guide to the very alien planets of our Solar System There are only eight planets in our solar system, but there are more than a hundred moons. Scientists believe that our moon and possibly other moons in the solar system were created when a large object such as an asteroid collided with the parent planet. Some may have been asteroids that got caught up in a planet's gravitation pull Our Solar System: Now With 2 Million Years More Maturity New measurements of an old rock show that the solar system may be up to 2 million years older than scientists previously thought Venus is the only other planet in solar system with active volcanoes By Georgina Torbet January 4, 2020 A composite image of the planet Venus as seen by the Japanese probe Akatsuki Meteorites are valuable to scientists because they provide clues about our solar system. Many meteorites are from asteroids that formed when the solar system formed (Figure below). A few meteorites are made of rocky material that is thought to have come from Mars when an asteroid impact shot material off the Martian surface and into space