21. ASTEROIDS - A Game By Michael Davies asteroids is a 3D game by Michael Davies, based on the old arcade classic in which you must destroy asteroids by breaking them up into smaller pieces. http://asteroids3d.sourceforge.net/

Overview SF Project Page Downloads Screenshots ... Contact Overview Asteroids is a 3D game by Michael Davies, based on the old arcade classic in which you must destroy asteroids by breaking them up into smaller pieces. It was developed in Visual C++ 6.0 with DirectX 8.1 over a period of approximately two months. It will run under any Windows system with DirectX 8.1+ and a 3D accelerator card. Top Downloads Asteroids v1.0 (5,478KB) - Main program executable and resources. Asteroids v1.0 Source Code (138KB) - Complete Visual C++ 6.0 project workspace. Top Screenshots Top Story Our entire military fleet is currently at war with the Martians and, as fate would have it, the asteroid field is too far away from Mars to reassign a Commander. You are the only armed ship within reach of the field. Your mission is simple: Eliminate all asteroids. Our information sources believe gravitational forces have banded the asteroid field into eight waves. This will provide time between each wave to repair your ship. almandine carconite , a rare, highly explosive mineral which is normally only safe at extremely low temperatures. This means a single shot from a laser turret will suffice to blow the asteroid into pieces, but be warned! The explosion will be so large that you are advised to stay well back. A severe explosion could interfere with your guidance systems, or ultimately obliterate your ship.

22. Asteroids From the Uppsala Planetary System Group. Overview, research projects, discoveries. http://www.astro.uu.se/planet/asteroid/

Asteroids Introduction In addition to the Sun and the major planets with their satellites, the solar system is populated with numerous comets and asteroids. These small bodies are the remains from the formation of the solar system some 5 billion years ago. Contrary the terrestrial planets, which are more or less geologically evolved, many comets and asteroids are to a large extent preserved in their pristine condition. Most asteroids are found in the main-belt between the orbits of Mars and Jupiter, and are most probably the remains of a planet that failed to form, due to the perturbations of Jupiter. An almost equally large population is the Trojan asteroids, which are trapped in the two Lagrangian points 60 degrees ahead of and behind Jupiter in its orbit. Another important group is the near-Earth asteroids, where several are on Earth-crossing orbits and may pose a potential threat upon the Earth The study of asteroids is one important key to the understanding of the early solar system. The evolution of the asteroids and their interactions in the present-day solar system are also important issues. There are many open questions related to the distribution of mass, angular momentum, and chemical composition in the main-belt. The few images available of asteroids show highly irregular shapes, indicating violent histories of impacts and collisions. The traditional distinction between comets and asteroids seems to become increasingly more vague with new discoveries of borderline and transitional objects.

23. Asteroids Arcade Game: Surfing The Net With Kids Play free online asteroids arcade game from Surfnetkids.com. Shoot the asteroids while avoiding collisions with them. http://www.surfnetkids.com/games/asteroids-game.htm

...Click for Menu... ~~ Home ~~ Light a Fire Quotations How to Add Games Email Book Clubs Book Store Calendar Blog Free Kids Coloring Free Kids Trivia Free Web Content Games Kids Jokes Newsletters Parents Postcards Printables Screensavers Suggest a Site Tell a Friend Top Ten Pages Topic Directory ~~ Search this Site Arts, Crafts, Music Computers, Internet Hobbies, Sports Geography Holidays, History Language Arts Math Parents, Teachers Pre-K and K Science, Animals Link to Us My Bio Ad Rates Write Me Visit My Office Audiobooks Calendar Coloring Contests ... Naruto Girls Dress Up Asteroids Arcade Game Shoot the asteroids while avoiding collisions with them in this fast paced shooting game. Arcade Games Shooting Games Instructions Wait for the applet and sounds to load, then click on the applet area and press the 'S' key to start. Shoot the asteroids while avoiding collisions with them. Occasionally a flying saucer will appear and attempt to shoot you down with guided missles. Destroy it or the missles for more points. You begin with three ships, a bonus ship is awarded for every 5000 points scored. Keyboard Controls Key Description Key Description S Start Game P Pause Game Cursor Left Rotate Left Cursor Right Rotate Right Cursor Up Fire Thrusters Cursor Down Fire Retro Thrusters Spacebar Fire Cannon H Hyperspace M Toggle Sound D Toggle Graphics Detail Scoring Object Points Large Asteroid Small Asteroid UFO Missle var addtoLayout=0; // addtoLayout: 0=Horizontal 1 row, 1=Horizontal 2 rows, 2=Vertical with icons, 3=Vertical no icons var addtoMethod=1; // addtoMethod: 0=direct link, 1=popup var AddURL = document.location.href; // could be set dynamically to your blog post's permalink var AddTitle = escape(document.title); // same here, this could be set dymaically instead of the page's current title

24. Asteroids Game - Classic Arcade Fun Play the classic arcade game asteroids online. Faithful to the original version, this fun video game is a lasting favorite. http://www.springfrog.com/games/asteroids/

The whole world is just a hop away! Asteroids Game Classic Arcade Video Game Home Play more fun games online Win money simply by visiting Springfrog Add your website to Springfrog search engine ... Sign up for free for all of Springfrog's benefits now This is a faithful version of the classic Asteroids arcade video game. Your ship has found its way into a region of space cluttered with asteroids. Your hyperspace drive only has enough power to carry you a short distance - not enough to escape the deadly space rocks. Your only hope is to blast the asteroids out of the sky with your laser cannons...but...there could be more complications on their way too!!!.... The game screen below may take a few moments to download. Once you see the words " Game Over - 'S' to Start " you are ready to go. If the game does not seem to be responding to key presses, simply click your mouse pointer in the game area. Controls: S Start Game P Pause Game Cursor Left Rotate Left Cursor Down Reverse Thrust Cursor Right Rotate Right Cursor Up Forward Thrust Spacebar Fire Cannon H Hyperspace M Toggle Sound D Toggle Graphics Detail Scoring Large Asteroids Small Asteroids Flying Saucer Enemy Missile A new ship is awarded for every 5000 points scored.

25. Astronomy For Kids - Learn About Asteroids Learn some fun facts about the Asteroid belt with KidsAstronomy.com. http://www.kidsastronomy.com/asteroid.htm

26. Special Report On Comets And Asteroids - New Scientist Space Small primordial black holes in our cosmic backyard could knock asteroids out of safe orbits and towards Earth, say researchers http://space.newscientist.com/channel/solar-system/comets-asteroids

@import "/decorator/css/gridmain.css"; New Scientist Space Technology Environment ... Sea creatures had a thing for bling Fossilised sea creatures have been found that coated themselves in tiny diamonds created in the asteroid impact that killed off the dinosaurs EXPERT GUIDE Instant Expert: Comets and Asteroids Comets have been known, and often feared, since ancient times. Their spectacular appearance in the night sky, with wide bright tails , has inspired awe and even been considered an omen Asteroids, comets and other cosmic debris have also had a fundamental impact on the development of planet Earth and the life on it, by bombarding it constantly at first, and periodically since. Future impacts pose a significant threat to human civilisation. Comets are incredibly numerous - astronomers predict as many as one trillion could exist in the outer reaches of our solar system. Bright comets, however, appear in our skies just once a decade on average. The brightest recent ones were comets Hale-Bopp in 1996 and Hyakutake in 1997. Perhaps the most interesting recent comet was Shoemaker-Levy 9 . This broke apart into dozens of pieces which then crashed into Jupiter in 1994 more...

27. Asteroids | Universe Today If an asteroid or comet impacted Earth, the resulting ejection of materials could contain life forms. According to a study published in the journal http://www.universetoday.com/category/asteroids/

GA_googleAddAttr("Category", ""); GA_googleAddSlot("ca-pub-0569369285898441", "new_visitor_welcome"); GA_googleAddSlot("ca-pub-0569369285898441", "ut-leaderboard"); GA_googleAddSlot("ca-pub-0569369285898441", "ut-skyscraper1"); GA_googleAddSlot("ca-pub-0569369285898441", "ut-skyscraper2"); GA_googleAddSlot("ca-pub-0569369285898441", "ut-smallsquare-125x125"); GA_googleAddSlot("ca-pub-0569369285898441", "ut-square-300x250"); GA_googleAddSlot("ca-pub-0569369285898441", "ut_article_footer"); var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); Subscribe Podcast Home Additional Resources ... Mars May 6th, 2008 NASA Considers Manned Asteroid Mission What would happen if we spot a Near- Earth is at us. An asteroid named 2000SG344 (which threatened the Earth in the year 2000) is being considered as the destination for the first manned asteroid mission. The asteroid astronauts will travel there, chasing the 28,000 mi/hr (45,000 km/hr) speeding body and then carry out experiments, living on it for up to two weeks. Why? To briefly establish a manned outpost, advancing science and technology toward the ultimate goal: Mars. Asteroids Mars May 6th, 2008

28. Asteroids: Debris Of The Solar System asteroids are the leftovers of the rocks and ice which made the planets. http://starryskies.com/solar_system/Asteroids/asteroids_top.html

ASTEROIDS Debris in the Solar System When the Solar System formed, not everything was used to make planets and moons, leftovers became asteroids and comets. They are perhaps the oldest remnants of the early Solar System and what we learn from them tells us about our own early history. Most of the asteroids lie between the orbits of Mars and Jupiter, but some have very elliptical orbits which bring them very close to Earth. They range in size from about 30% the diameter of our moon to pebble sized objects. In number, there are probably billion of asteroids in the solar system. The largest known asteroid is Ceres which was the first asteroid to be discovered in 1801. Ceres is about 1/3 the size of our moon. It can be seen in amateur telescopes if one knows where and when to look. Most asteroids are of the small irregular variety. None of them are large enough to have high enough gravity to pull themselves into spherical shape. Images of the same asteroid vary in brightness which confirms the irregular shape. The Galileo spacecraft passed through the asteroid belt twice on its way to Jupiter. The spacecraft passed only 16.000 km from the asteroid Gaspra in 1990 and returned excellent images. Gaspra is an oblong world measuring 20 by 12 by 11 km. It is covered by a layer of shattered soil about a meter deep. There are also numerous craters on Gaspra's surface.

29. List Of The Potentially Hazardous Asteroids (PHAs) List Of The Potentially Hazardous asteroids (PHAs). Information on converting absolute magnitudes to diameters is available, as is an explanation of the http://cfa-www.harvard.edu/iau/lists/Dangerous.html

List Of The Potentially Hazardous Asteroids (PHAs) Information on converting absolute magnitudes to diameters is available, as is an explanation of the quantities given in the listings above A list of close approaches to the earth through the end of the 21st century is available NOTE: The quantity EMoid in the table below does not give any information on actual close approaches to the earthyou should consult the previously-referenced list for such details. See a plot of the innermost solar system (or the inner solar system This list is updated daily, except for the few days surrounding the preparation of each batch of MPCs . It is also updated as and when new objects are discovered. This list was last updated on 2008 May 28. Back to minor planet lists MPC CBAT

30. BBC - Radio 4 In Our Time - Asteroids In Our Time explores the history of ideas, this week asteroids. http://www.bbc.co.uk/radio4/history/inourtime/inourtime_20051103.shtml

//Set a cookie to expire in 8 weeks: bbcjs.cookies.setCookie("podcast_survey", "seen=yes", "+8W"); @import '/includes/bbcpage/v3-0/toolbar.css'; Skip to main content Text Only version of this page Access keys help Home Explore the BBC Accessibility help Text only BBC Homepage ... Radio 4 PROGRAMME FINDER: A-Z Directory Listen Again Download/Podcast What's On Listings ... Presenters PROGRAMME GENRES: Arts and Drama Science History Factual TOP PROGRAMMES THIS WEEK: The Archers Today Programme Woman's Hour In Our Time ... Contact Us Like this page? Send it to a friend! In Our Time MISSED A PROGRAMME? Go to the Listen Again page PROGRAMME INFO Thursday 9.00-9.45am repeated 9.30pm The big ideas which form the intellectual agenda of our age are illuminated by some of the best minds. Melvyn Bragg and three guests investigate the history of ideas and debate their application in modern life. LISTEN AGAIN Listen to this edition of In Our Time PRESENTER Melvyn Bragg BIOGRAPHY PROGRAMME DETAILS Thursday 3 November 2005 ASTEROIDS Read audience reactions to this edition. Go to our research page to find out more about this subject Asteroids used to be regarded as the 'vermin of the solar system', irritating rubble that got in the way of astronomers trying to study more interesting phenomena. It was difficult or even impossible for an observer of asteroids to book time using the world's best telescopes, because they were regarded as unspectacular objects that could tell us little about the origins of the universe. However, that has all changed. It is now thought that asteroids are the unused building blocks of planets, 'pristine material' that has remained chemically unchanged since the creation of the solar system; a snapshot of matter at the beginning of time. At the moment the Japanese probe Hayabusa is 180 million miles away, pinned to the back of the asteroid Itokawa, attempting to gain our first samples of the chemical composition of an asteroid.

31. Asteroids - Crystalinks An asteroid is a small, solid object in our Solar System, orbiting the Sun. An asteroid is an example of a minor planet (or planetoid). http://www.crystalinks.com/asteroids.html

Asteroids An asteroid is a small, solid object in our Solar System, orbiting the Sun. An asteroid is an example of a minor planet (or planetoid). These minor planets are much smaller than the small planets such as Mercury or Mars. It is believed that most asteroids are remnants of the protoplanetary disc. The incorporation of these remnants into the planets during the formation of the Solar System was prevented by large gravitational perturbations induced by Jupiter. Some asteroids have moons. The vast majority of the asteroids are within the main asteroid belt, with elliptical orbits between those of Mars and Jupiter. In the last years of the 18th century, Baron Franz Xaver von Zach organized a group of 24 astronomers to search the sky for the "missing planet" predicted at about 2.8 AU from the Sun by the Titius-Bode law, partly as a consequence of the discovery, by Sir William Herschel in 1781, of the planet Uranus at the distance "predicted" by the law. This task required that hand-drawn sky charts be prepared for all stars in the zodiacal band down to an agreed-upon limit of faintness. On subsequent nights, the sky would be charted again and any moving object would, hopefully, be spotted. The expected motion of the missing planet was about 30 seconds of arc per hour, readily discernable by observers.Ironically, the first asteroid, 1 Ceres, was not discovered by a member of the group, but rather by accident in 1801 by Giuseppe Piazzi director, at the time, of the observatory of Palermo, in Sicily.

32. Main Asteroid Belt asteroids are primoridal objects left over from the formation of the Solar System. While some have suggested that they are the remains of a protoplanet that http://www.solstation.com/stars/asteroid.htm

Main Asteroid Belt Home Stars Orbits Habitability ... Ceres NASA Larger image Stoney asteroid Ida and its satellite Dactyl (more information and orbit Breaking News On August 24, 2006, the International Astronomical Union voted at the end of its 26th General Assembly to establish a new class of substellar objects in the Solar System called "dwarf planets", which may eventually encompass the largest, relatively round asteroids such as Ceres and perhaps eventually Vesta, Pallas, and Hygeia. Asteroids Asteroids are primoridal objects left over from the formation of the Solar System. While some have suggested that they are the remains of a protoplanet that was destroyed in a massive collision long ago, the prevailing view is that asteroids are leftover rocky matter that never successfully coalesced into a planet. Most planetary astronomers still believe that the planets of the Solar System formed from a nebula of gas and dust and ices that coalesced into a dusty disk around the developing Sun . Within the disk, tiny dust grains (and ices in the colder environs beginning around two AUs inside of Jupiter's orbit) coagulated into larger and larger bodies called planetesimals, many of which eventually accreted into planets over a period as long as a 100 million years. However, beyond the orbit of

33. Asteroid -- From Eric Weisstein's World Of Astronomy An asteroid is a rocky body which is gravitationally bound to and orbits the Sun. The majority of asteroids lie in a region called the asteroid belt which http://scienceworld.wolfram.com/astronomy/Asteroid.html

Solar System Asteroids and Meteorites Asteroids Asteroid An asteroid is a rocky body which is gravitationally bound to and orbits the Sun . The majority of asteroids lie in a region called the asteroid belt which is located between the orbits of Mars and Jupiter . Some of the largest asteroids are listed in the table below. number name Ceres Pallas Juno Vesta Asteroids whose orbits have been determined carefully enough so that their position on the sky as a function of time can be predicted are assigned permanent numbers and names by the Minor Planet Center . At present, there are more than 8,700 numbered asteroids ( Minor Planet Center , Schmadel 1997). Astroid names are chosen by the discoverer , and some noteworthy names assigned to asteroids are 3834 Zappafrank, 2906 Caltech, 2404 Antarctica, 5102 Benfranklin, 7850 Buenos Aires, 10221 Kubrick, etc. Asteroids are placed in families having similar orbits, with the most common families being the Amor Apollo , and Aten groups, each named after a prominent asteroid in a given group. The approximate number of known members of each group is listed in the following table ( Minor Planet Center Earth-crossing asteroids are called Apollo asteroids . A table of large Apollo asteroids is contained in (March 1990).

34. Asteroid More than 20000 asteroids have been given official designations, most of them in the asteroid belt between the orbits of Mars and Jupiter. http://www.daviddarling.info/encyclopedia/A/asteroid.html

NOTABLE ASTEROIDS PLANETARY SCIENCE A B ... CONTACT entire Web this site asteroid Asteroid Gaspra taken by NEAR-Shoemaker as it flew by A rocky or metallic object, generally smaller than a planet but bigger than a meteoroid , that orbits the Sun or another star. Asteroids are also called minor planets. The largest asteroid, Ceres , however, has been classified as a dwarf planet More than 20,000 asteroids have been given official designations, most of them in the asteroid belt between the orbits of Mars and Jupiter . Asteroids outside this belt include the Trojans , which share Jupiter’s orbit, and the near-Earth asteroids . A number of different asteroid groups have been distinguished on the basis of their similar orbital characteristics. Other sub-planetary objects, considered distinct from asteroids, are Centaurs Kuiper Belt objects , and comets , though classification is ambiguous in some cases. Some of the smaller moons in the solar system appear to be captured asteroids, including the two moons of Mars, and a number of the outer moons of the four gas giants. Asteroids range in size from a few meters to over 900 km across, and vary greatly in composition. Although none is visible to the naked eye, many can be seen at times with binoculars or small telescopes, including the four largest: (1)

35. Howstuffworks "How Asteroids Work" 12, 2001, the Near Earth Asteroid Rendezvous spacecraft made a controlled descent to the surface of asteroid 433 Eros, after orbiting it for a year. http://science.howstuffworks.com/asteroid.htm

HowStuffWorks.com RSS Make HowStuffWorks your homepage Get Newsletter Search HowStuffWorks and the web: Science Space Astronomy Astronomy is a broad discipline covering all facets of astrophysics. In this section you can learn about the origins of the universe, black holes and other astronomical phenomena. Related Categories: REFERENCE LINKS Print Email Cite Please copy/paste the following text to properly cite this How Stuff Works article: How Asteroids Work by Craig Freudenrich, Ph.D. Inside This Article Introduction to How Asteroids Work Asteroid Classification Project NEAR NEAR Lands on Eros Lots More Information ... articles Q: How did a NASA spacecraft land on an asteroid? A ­ Credit NASA with another milestone in space exploration: On February 12, 2001, a spacecraft landed on the surface of an asteroid for the first time in history. After a year spent orbiting the asteroid 433 Eros, the Near Earth Asteroid Rendezvous (NEAR) spacecraft made a controlled descent to the surface. But what exactly is an asteroid? And what was the NEAR Shoemaker mission about? In 1772, a mathematician named

36. Apple - Downloads - Dashboard Widgets - Asteroids Widget Play the classic arcade game asteroids right on your Dashboard. http://www.apple.com/downloads/dashboard/games/asteroidswidget.html

var searchSection = 'downloads'; var searchCountry = 'us'; Apple Store Mac iPod + iTunes ... Support Search All Downloads All Categories Aperture Apple Application Updates ... Widgets Top Apple Downloads 1. iTunes 7.6.2 2. QuickTime 7.4.5 3. Safari 3.1.1 4. Boot Camp Update … ... Bonjour for Windows This update is recommended for all Bonjo… 9. Mac OS X 10.4.11 C… 10. Boot Camp Update … 11. Java for Mac OS X … 12. iPod Updater 2006-… ... 14. AirPort Utility 5.… Top Downloads 1. iTunes 7.6.2 2. QuickTime 7.4.5 3. Safari 3.1.1 WhiteCap iTunes Vi… A sleek and sophisticated music visualiz… 5. Messenger for Mac 6. Ultralingua Dictio… 7. djay 8. TomTom HOME ... RSS Asteroids Widget About Asteroids Widget - [New Feature] Hyperspace Download Download Details Company: Christopher Marks Version: Post Date: October 17, 2005 License: Freeware File Size: URL Type: Download Download ID: System Requirements Mac OS X 10.4 or later Select a category... Dashboard Home Just Added Top 50 Business (148) Developer (123) Food (48) Games (207) Information (94) International (880) Just For Fun (178) Music (192) News (295) Reference (230) Search (173) Shopping (196) Sports (160) Status (217) Transportation (80) Travel (66) Webcams (71) Apple is providing links to these applications as a courtesy, and makes no representations regarding the applications or any information related thereto. Any questions, complaints or claims regarding the applications must be directed to the appropriate software vendor.

37. Widgetbox › Asteroids Widget Get the asteroids widget on Widgetbox.com! Classic arcade action destroy all the asteroids, but the more you shoot, the more asteroids you create. http://www.widgetbox.com/widget/asteroids

Why use Widgetbox Register Sign in Widgetbox ... Gallery Categories GO Please fix the following errors: Name is required field. Width and Height are required for this widget. Asteroids by Paul Neave Let me take you back... back to a world before pixels. In those days, all people had were lines. A company called Atari had recently wowed crowds with their clever use of lines in a game called Pong, but now this line technology had advanced. It was 1979, and lines could be made to look like spaceships and big rocks and more flying saucers, as long as you squinted a little. And so, Asteroids was born. You float in space and shoot the asteroids, but the more you shoot, the more asteroids you create. And be careful: you only have one ship for each 10,000 points scored. (High scores for Asteroids are reset weekly, every Sunday night.) Controls: Left arrow key – Turn left Right arrow key – Turn right Up arrow key – Thrust forward Space bar – Fire missile "P" key – Pause/unpause game

38. Xbox.com | Asteroids©, Asteroids Deluxe© - Game Detail Page In asteroids and asteroids Deluxe, gamers can revisit the classic Atari arcade games, and play evolved versions of both games with HDTV support. http://www.xbox.com/en-US/games/splash/a/asteroidsxboxlivearcade/

var XbcSiteRequirementsUrl = 'http://www.xbox.com/en-US/support/SiteRequirements.htm'; United States International Forums Sign in Search: Get Your Gamercard My Xbox View Messages View Friends ... Forums Screenshots Features Two of the all-time classic arcade games come to Xbox LIVE® Arcade in Asteroids©, Asteroids Deluxe© , a combo of intense action where players must save earth from a deadly bombardment of asteroids. The full historic game is available in its original form, along with a completely re-stylized version featuring evolved graphics. The original Asteroids Released in 1979 by Atari, the simple black and white game was a masterpiece of vector graphics game design, and had millions of arcadegoers entranced by its simple mechanic of controlling a spaceship firing at and destroying asteroids. The release of Asteroids Deluxe The sequel to the original, released in 1980, Asteroids Deluxe featured the same classic gameplay but added a new shield feature and dangerous satellite enemies. Play both the original and its sequel in all of its classic old-school style. Next-gen evolution: But now, both games have evolved. Support is provided for both 4:3 and 16:9 aspect ratios, including HDTV. Full-screen anti-aliasing and Dolby Digital surround sound complete the gaming experience.

39. Asteroids - Online Flash Retro Game asteroids free online flash classic arcade game, flash version of atari classic, retro vector graphics and high scores. http://www.goriya.com/flash/asteroids/asteroids.shtml

flash games java games pc game downloads apple mac games ... game shop your favourites buy games random flash game random java game highscore games search mailing list faq's and help topsites gaming news rss feeds asteroids tell a friend view left/right cursors for movement, up cursor - thrust, space - missile, shift - hyperspace, p - pause, q - quit link to goriya

40. Asteroids: Research Links For Students This page contains links to a series of web pages that support online study of asteroids. http://www.stemnet.nf.ca/CITE/solar_asteroids.htm

As Featured April /01 Gander Academy's Asteroids Mercury Venus Earth Mars ... Asteroids On the first day of January 1801, Giuseppe Piazzi discovered an object which he first thought was a new comet. Asteroids: Cosmic Leftovers When we think of the solar system, we tend to think of the Sun, its nine planets and their moons. But there is much more going on here than meets the eye. The empty spaces of our solar system are littered with small objects known as asteroids and comets. Asteroid Factsheet The image above is a false color view of the asteroid 951 Gaspra taken by the Galileo spacecraft. values for mass and many of the diameter values are only rough estimates. Earth Crossing Asteroids The primary purpose of these pages is to describe and present results from NASA-sponsored research on the physical modeling of Earth-crossing asteroids using radar and optical data Asteroids Astronomers used to dismiss asteroids as uninteresting "vermin of the skies." But we now realize that these small, rocky bodies hold important clues to the nature of our planetary system and its earliest history. Asteroids Quick quiz: How many planets orbit our Sun? If you said nine, you're shy by several thousand. Scientists consider asteroids to be minor planets - some are hundreds of miles wide (and seldom round).

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