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         Asteroids:     more books (100)
  1. Asteroids: A History by PEEBLES CURTIS, Curtis Peebles, 2001-09-01
  2. Asteroid: Earth Destroyer or New Frontier? by Patricia Barnes-Svarney, 2003-08-01
  3. The Wailing Asteroid by Murray Leinster, 2004-06-17
  4. Impact!: The Threat of Comets and Asteroids by Gerrit L. Verschuur, 1997-12-18
  5. The New Tom Swift Jr. Adventures, Tom Swift and the Asteroid Pirates by Victor Appleton II, 1963
  6. The Wailing Asteroid by Leinster. Murray, 1960
  7. Man and Impact in the Americas
  8. Comets, Asteroids, & Meteorites (Voyage Through the Universe)
  9. Doomsday Asteroid: Can We Survive? by Donald W. Cox, James H. Chestek, 1998-06
  10. Asteroid Rendezvous: NEAR Shoemaker's Adventures at Eros
  11. The Age of Asteroids  by Elijah I. Toten, 2004-04-05
  12. Asteroids, Comets, And Meteoroids (The Universe) by Fran Howard, 2008-01
  13. Asteroids, Comets, and Meteorites: Cosmic Invaders of the Earth (The Living Earth) by Jon Erickson, 2003-02
  14. Let's Explore Comets and Asteroids (Space Launch!) by Helen Orme, David Orme, 2007-01-12

41. Neave Games › Asteroids
And so, asteroids was born. It s an elegantly simple game, but beautifully gratifying.You float in space and shoot the asteroids, but the more you shoot,
http://www.neave.com/games/asteroids/
Asteroids
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 line technology had advanced. It was 1979, and lines could be made to look like spaceships and big rocks and flying saucers... as long as you squinted a little.
And so, Asteroids
Asteroids links:
Official Asteroids
Asteroids screenshots Java Asteroids
Macromedia Asteroids
... Icebreaker
Other Neave Games...
Snake
Space Invaders Tetris Tic-Tac-Toe ... more... Please note: not Atari, Inc.
Left arrow - Turn left
Right arrow - Turn right
Up arrow - Thrust forward
Space - Fire missile Shift key - Hyperspace P - Pause/unpause game Q - Quit game (mt) Paul Neave blog inspiration ... who?

42. Gamegurl.com
Includes arcade titles such as asteroids, UFO Attack, and Snake Pit.
http://www.gamegurl.com
g a m e g u r l
arcade games

adventure games

shooting games

space games
...
send link to a friend

a r c a d e . g a m e s tempest 1000
gamegurl's favorite arcade game of all time pacman
flash pacman, not ms. pacman tetris
people love this game for soem reason urbanoids
a very complex and beautifully designed game critturs whack-a-mole without the mess bubble beat the high scores of the previous punks galaxy tag play tag in a world of spheres and spirals graph game make your way across the graph ancient boy break the eggs with your bone lickety splat how fast can you lap up the flies lemonade stand it's a great day for a front yard sale. but how good are you at running a business? trouble underground help the moles and worms get out rain drop game collect the raindrops and avoid the blob jamidar trace the squares to fill them in blisterball shoot the bouncing balls a d v e n t u r e . g a m e s tux on the run a cool penguin game iceblox another cool penguin game GO LINUX! cliffie deliver the mail then you can have a beer don's dugout don't eat the microwave cheese benny save your girlfriend from the evil clown mario oldie but goodie munchmaster eat donuts and squish the critters cross section another fun penguin adventure s h o o t i n g . g a m e s

43. Bullseyes Games - Free Games, Online Games, Download Games, Free Online Games, F
Offers games such as solitaire, worms, yahtzee, checkers, trivia, and asteroids.
http://www.bullseyesgames.com
Online Games Download Games Join [Login] ...
Trivia
ONLINE GAMES
Featured Online Games Apple Catcher
Catch the Apples before they hit the ground. Balloon Popper
Try to pop the balloons before they float away. Bullseyes Race
The logest race game in the history of racing Bullseyes Poker
Free Poker game where you make a pretend bet. ONLINE
ACTION GAMES
RaceWay

The longest race game in the history of racing. Nibbly

As a green worm try to eat as many apples as you can. Basketball

Practice shooting basketball hoops. See All
ONLINE
ARCADE GAMES Bullseye Attack
Shoot all the bullseyes before they land. Stack Bullseyes
Quickly try to stack the bullseyes as they fall. Pacman Starring a pill-popping yellow blob, that eats ghosts. See all ONLINE BOARD GAMES Battleship Play against the computer in this online version. Connect Four Flash version of the classic board Connect Four game. Yahtzee Online version with the computer keeping the score. See all ONLINE CASINO GAMES Blackjack Make a pretend bet and try get the total score of 21. Lucky Slots Bet with pretend cash. Spin the wheel, and good luck.

44. Jacob Schwartz, Ph. D. -- ASTEROIDS
Articles about asteroids and astrology, with analysis of the September 11th terrorist attacks and Timothy McVeigh's chart. Also features a complete asteroid name list.
http://www.asteroids.com
(connecting the cosmos to earthly experience) Order Asteroids' Products Contact Jacob Home Cosmic Portrait for Islam ... Order Products and Services (that require chart data) Order Products and Services (that DO NOT require chart data) Articles by Jacob Hot Asteroid Stories Cosmic Portrait for Islam White House NATO McVeigh ...
HealthBann Plus Banner Exchange Member
Forecasts by Jacob
Every month, since September 1987, I've written an astrology column for a local complementary magazine distributed the Delaware Valley of southeastern Pennsylvania, southern and central New Jersey, and Delaware. The publication is now New Vision Magazine, which succeeded Visions Magazine, and before that I wrote for New Frontier Magazine.
The column has the usual Aries through Pisces paragraph for the month, unlike others in that it includes more astrology and astronomy than most others.
However, unlike other columns, this one included several introductory paragraphs relevant to everyone, the nation, and the planet. In the October 2000 issue, I described a deadlocked election in November 2000 with Gore winning the popular vote and Bush the electoral with Bush being elected by the electoral college in December.
In the column for September 2001, I mentioned an attack on the United States from outside enemies.

45. Asteroids
Most asteroids are found in the mainbelt between the orbits of Mars and Another important group is the near-Earth asteroids, where several are on
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.

46. BBC News | SCI/TECH | Asteroids 'affected Human Evolution'
The ascent of mankind could have been influenced by frequent cosmic catastrophes.
http://news.bbc.co.uk/1/hi/sci/tech/1272368.stm
low graphics version feedback help You are in: Sci/Tech Front Page World UK ... AudioVideo
Thursday, 12 April, 2001, 10:36 GMT 11:36 UK Asteroids 'affected human evolution'
A threat to our early ancestors?
By BBC News Online science editor Dr David Whitehouse Impacts by asteroids may have affected the course of human evolution, according to two researchers studying how often the Earth has been struck in the past. They say that rather than gradual and uninterrupted human evolution, the ascent of mankind could have been influenced by frequent cosmic catastrophes.
It is sobering to realise that we are alive due to cosmic luck rather than our genetic make-up
Dr Benny Peiser, John Moores University, UK Their work, they say, explains one of the biggest problems that has puzzled researchers for generations: why almost all human-like creatures or hominids, have become extinct during the past five million years. According to traditional theories of evolution, our early ancestors were slowly and gradually replaced because they failed to compete with other human species that had superior "fitness". But according to Dr Benny Peiser, a social anthropologist at John Moores University in Liverpool, UK, and Michael Paine, an impact researcher from the Planetary Society in Australia, the most likely cause of hominid extinctions may be more than 20 globally devastating catastrophes that occurred over the last five million years.

47. Welcome To SPACE PHYSICS! Physics Of Space Objects
Includes discussions of gravity, orbits, energy, and Kepler's and Newton's laws. Includes activities and links.
http://ca.geocities.com/spacephysicsisu/
THE PHYSICS OF: Visitors since April 2002:
Search

Topics:
Asteroids

Comets

Meteoroids

Physics Applications:
Introduction to Gravity

The Slingshot

Kepler's Laws

Newton's Laws
... Types of Orbits
Activities: Lab: Crater's Diameter Lab: Probability of Asteroid Striking Bibliography: Books Websites Is Space Our Final Frontier? This website addresses the physics of Asteroids, Comets and Meteoroids as well as their unique characteristics and impact on society. Historically, space has fascinated scientists throughout the centuries. In 1923, scientists realized that millions of other galaxies made up the universe and that the universe covered a vast area larger than previously thought. Overtime, technological advances have enabled astronomers, scientists and researchers to uncover the hidden depths and structures that make up space. The following links to the left are intended to help students learn how physics applies to asteroids, comets and meteoroids. Note to visitors: Many of the images contain information that may be accessed by placing the mouse's arrow over the picture. After a few seconds, a yellow box should appear with text and information relating to the image. Inside a stony-iron meteorite!

48. PERMANENT - Asteroids Near Earth - Location, Geology Etc
Most of the literature refers to the near Earth asteroids as NEAs or NEOs The vast majority of Near Earth asteroids are thought to have originated in
http://www.permanent.com/a-geolog.htm
Asteroids Near Earth Index Overview Asteroids Locations Geologies Meteorites Origins Compositions ... To Do List
There are four classes of asteroids discussed in this book, based on their location:
  • Main Belt asteroids a band of asteroids located in the "missing planet" gap between Mars and Jupiter. None of these are economically attractive in a near term program because they are too far from Earth. Amor asteroids asteroids whose orbits approach but do not cross Earth orbit, and whose orbits are further from the Sun than Earth's orbit (i.e., "outside-t" Earth orbit). Many have orbits which reside entirely between Earth and Mars. Some of these are economically attractive in the near term. Apollo asteroids asteroids whose orbits cross Earth's orbit. Apollo asteroids spend most of their time outside Earth orbit. Many of these are economically attractive in the near term. Aten asteroids asteroids whose orbits cross Earth's orbit. Unlike Apollos, Atens spend most of their time inside Earth orbit. A large percentage of known Atens are economically attractive in the near term.
  • This figure shows an example of an Amor, an Apollo and an Aten orbit.

    49. A Backyard Astronomer
    For beginning backyard astronomers, listing planetary positions, comets, asteroids, meteor showers, tips lots of links.
    http://www.geocities.com/CapeCanaveral/Hall/7536/index.html
    Backyard Astronomy
    formerly Barbara's Backyard Astronomy Page Next ===> Imaged by the
    Hubble Space Telescope
    Imaged by the
    Cassini-Huygens Space Probe
    Table of Contents: Home Page About Me Star Journeys Getting Started Equipment ... Suggested Reading Mars, Meteors and Comets Oh my! Mars is coming, will you be ready You will if you take the time to observe it early on. This aberration will be almost as good as the one in 2003. I mean what's a few million miles among friends anyhow? Oh and about that email going around about Mars looking as large as a full moon. Well if that ever happened we'd be in a world of hurt. I mean think about it Mars mass is way more than our moon and wow would we have high tides! In fact Earth would bulge on the side facing Mars. Be glad it's not true! Now on to what is true Mars is showing much detail in the eyepiece for those patient enough to really see the planets surface. This is why you must get out and view it early before it reaches opposition, as it is much more exciting to see the planet get larger and easier to see with each successive week than to see it shrinking and fading away. Plus you run the risk of not seeing anything at all because of a planetary wide dust storm as in 2001. They are rare, but can happen on or after perihelion ( Mars closest approach to the sun ). Anytime you can see Mars in the sky is a good time, the full moon won't interfere with views. You do want a steady night, but it doesn't have to be the most clear. Check your

    50. List Of The Potentially Hazardous Asteroids (PHAs)
    List Of The Potentially Hazardous asteroids (PHAs). Information on convertingabsolute 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 Min. 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 2005 Sept. 18. Back to minor planet lists MPC CBAT

    51. Near Earth Asteroid Rendezvous Mission
    NEAR First spacecraft to orbit an asteroid, to answer fundamental questions about the nature and origin of near-Earth objects, such as the numerous asteroids and comets in the vicinity of Earth's orbit. First launch in the Discovery Program, a NASA initiative for small planetary missions.
    http://near.jhuapl.edu/
    NEAR Shoemaker's Final Images
    Descent to Eros information

    February 14 Press Conference slides

    NEAR Shoemaker's Descent Movies

    Science Update On Monday, 12 February 2001, the NEAR spacecraft touched down on asteroid Eros, after transmitting 69 close-up images of the surface during its final descent. Watching that event was the most exciting experience of my life. [ More
    Science Update Archive
    Where Is NEAR Shoemaker? Landed on Eros Feb. 12, 2001
    Where is Eros?

    Mission Design

    Mission News (December 12, 2002) NEAR Shoemaker's Silent Treatment Even though the NEAR Shoemaker spacecraft had exceeded every mission expectation, the NEAR team asked for one more spectacular addition to the mission's legacy: Talk to us one more time.
    More
    News Archive NEAR Awards Data from Eros
    Gamma-Ray Readings Image of the Day Archive News Center Science and Engineering Operations ... NASA TV Nature Articles: Sep. 26, 2001 Science Articles: Sep. 21, 2000 Apr. 20, 2001

    52. CNN - Tomorrow/Today: Listening For Asteroids - July 2, 1998
    CNN
    http://www.cnn.com/TECH/science/9807/02/t_t/listening.for.asteroids/index.html

    MAIN PAGE
    WORLD ASIANOW U.S. ... news quiz
    CNN WEB SITES: TIME INC. SITES: Go To ... Time.com People Money Fortune EW MORE SERVICES: video on demand video archive audio on demand news email services ...
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    DISCUSSION: message boards chat feedback
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    An expanded Web version of segments seen on CNN Ultra-low-frequency microphone
    Listening for asteroids
    July 2, 1998
    Web posted at: 2:11 p.m. EDT (1811 GMT) From Correspondent Rick Lockridge LOS ALAMOS, New Mexico (CNN) Current movies like "Deep Impact" and " Armageddon " would have you believe Earth has become a magnet for Texas-sized asteroids and comets hurtling through space. Actually, most of the rocks and iceballs that pepper the planet burn up high in the atmosphere. Only a few last long enough to give people on the ground a few oohs and ahhs. Such fireballs are easy enough to spot at night but often pass unseen during the light of day. Unseen, perhaps, but not unheard. While you can't always see the asteroids and meteors headed our way, scientists at the Los Alamos National Laboratory can hear them with the help of a strange-looking microphone.

    53. Asteroids: Surfing The Net With Kids
    The best asteroid sites for kids, teachers and families, from United Feature Syndicate.
    http://www.surfnetkids.com/asteroids.htm
    ...Click for Menu... ~~ Home ~~ Light a Fire Quotations How to Add Games Email Book Clubs Book Store Coupons Calendar Blog Free Web Content Games 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 From my Mailbox My Bio Ad Rates Write Me Visit My Office
    Related Games
    Asteroid Word Search

    Asteroids Arcade Game

    Stroids Arcade Game

    Space Crossword

    Related Sites
    Backyard Astronomy

    Space for Kids

    Space Mysteries

    Read Reader Suggestions
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    54. Asteroids
    asteroids are rocky and metallic objects too small to be considered planets. The name asteroids, meaning starlike , derives from the fact that,
    http://csep10.phys.utk.edu/astr161/lect/asteroids/asteroids.html
    Asteroids
    Asteroids are rocky and metallic objects too small to be considered planets. They are sometimes called minor planets . They range in size from Ceres, with a diameter of about 1000 km, down to a few centimeters or less. The ajacent image shows the asteroid Gaspra, as photographed by the Galileo space probe (Ref) . The name asteroids, meaning "star-like", derives from the fact that, compared with comets, they are star-like in appearance because since they are rocky they do not emit the gases and dust that give comets their fuzzy appearance. Asteroids on a collision course with Earth are called meteoroids . If this meteoroid burns up because of frictional heating when it strikes our atmosphere, we term it a meteor (colloquially, a "shooting star"). If the meteoroid doesn't burn up completely and strikes the Earth we call it a meteorite . We shall discuss, meteoroids, meteors, and meteorites in the next section. Next Back Top Home Help

    55. CNN.com - Study: Asteroids Shaped Mars Canyons - Dec. 5, 2002
    CNN
    http://cnn.com/2002/TECH/space/12/05/mars.water.hfr/index.html
    CNN Europe CNN Asia Languages Spanish Portuguese German Italian Korean Arabic Japanese On CNN TV Transcripts Headline News CNN International ... Special Reports SERVICES Video E-mail Newsletters CNNtoGO SEARCH Web CNN.com
    Study: Asteroids shaped Mars canyons
    Martian wet seasons may not have supported microbes
    By Richard Stenger
    CNN
    Valles Marineris, called the Grand Canyon of Mars, dominates the planet's southern highlands. Story Tools
    RELATED Science magazine Mars exploration (NASA) BIG DITCH Valles Marineris, dubbed the Grand Canyon of Mars, is more than four times longer and deeper than its terrestrial counterpart. The red planet trench is 2,500 miles long and up to four miles deep. (CNN) The authors of a new study say that while enormous surges of water carved out sprawling networks of valleys on Mars eons ago, the young red planet was hardly a steamy greenhouse with long-lasting oceans, as some scientists have theorized. Researchers with NASA and the University of Colorado say the canyons most likely were formed during brief bouts of torrential rains, when asteroid and comet chunks collided with Mars and unleashed frozen water. They propose that the flurry of impacts produced periodic layers of hot debris that blanketed the surface, warming it above the freezing point of water for decades or centuries at a stretch.

    56. Astronomy For Kids - Learn About Asteroids
    Learn some fun facts about the Asteroid belt with KidsAstronomy.com.
    http://www.kidsastronomy.com/asteroid.htm
    The Asteroid Belt
    What Would You Like To Learn About?
    The Sun

    Learn About The Planets
    Mercury
    Venus Earth Mars ... Pluto
    Learn About The Moons of Our Solar System
    Earth's Moon
    Mars' Moons Jupiter's Moons Saturn's Moons ... Pluto's Moon
    Learn About Astroids And Comets
    Astroids
    Comets
    All Planets
    (For Printing)
    All Moons
    Make-A-Solar System What are asteroids? An asteroid is a large rock in outer space. Some, like Ceres, can be very large, while others are as small as a grain of sand. Due to their smaller size, asteroids do not have enough gravity to pull themselves into the shape of a ball. Astronomers group asteroids into different categories based on the way they reflect sunlight. The asteroid belt is divided into an inner belt and an outer belt. The inner belt which is made up of asteroids that are within 250 million miles of the Sun contains asteroids that are made of metals. The outer belt, which includes asteroids 250 million miles beyond the Sun, consists of rocky asteroids. These asteroids appear darker than the asteroids of the inner belt, and are rich in carbon.

    57. Earth-Crossing Asteroids
    Certain groups of asteroids have elliptical orbits that cross the orbit of theEarth and other Thus, these asteroids can come very close to the Earth.
    http://csep10.phys.utk.edu/astr161/lect/asteroids/collisions.html
    Earth-Crossing
    Asteroids
    Certain groups of asteroids have elliptical orbits that cross the orbit of the Earth and other inner planets. Thus, these asteroids can come very close to the Earth. This provides a rationale to study such asteroids beyond the merely scientific one.
    The Earth-Crossing Asteroid 1995 CR
    The adjacent animation illustrates the orbit of asteroid 1995 CR , which was only discovered in 1995. The animation covers the two years-February 3, 1994 through February 3, 1996-at approximately 1 month intervals, except near the time of discovery (February 3, 1995) where the interval is about 10 days. This asteroid is of a relatively rare type with an orbital period much faster than that of the Earth. Notice that its orbit crosses the orbit of all 4 of the inner planets (though not obvious here, the orbit is almost in the plane of the ecliptic). On February 22, 1995 (2 1/2 weeks after discovery), this asteroid passed within 7.5 million km of the Earth-a distance only 20 times that of the distance to the Moon (note that in the animation the sizes of the planetary disks and of the asteroid are greatly exaggerated). Notice how rapidly the asteroid moves on the inner part of its orbit (Kepler's 2nd Law). It covers approximate half of the distance around its orbit in only about 2 months when it is near the Sun! Here is the

    58. Untitled Document
    Includes a multimedia tour that provides a history background dedicated to these bodies as well as images that present the actual position of them.
    http://www.geocities.com/zlipanov/

    59. Pop-Culture-Corn: Music: Meco - Dance Your Asteroids Off
    Review by Matt Springer, 4 of 5 cheerios. There isn't a bad track on Dance Your asteroids Off, but there isn't really a good track, either, and that's what makes it a priceless gem.
    http://www.popculturecorn.com/music/issues/apr00/review-meco.html
    Meco, Dance Your Asteroids Off
    Record Label: Mecoman April 2000 Review by Matt Springer
    What's the kitschiest CD you own? Go ahead; take a look. Flip through the racks of your personal collection and pick one out. Is it Milli Vanilli? Vanilla Ice? Regis Philbin? It should be Dance Your Asteroids Off , the new compilation disc from Meco. Do you remember Meco? He did a series of inexplicably successful revisions of classic film scores throughout the late seventies and early eighties, including the Close Encounters theme and The Wizard of Oz . This collection focuses solely on the work he did using John Williams' music from the Star Wars films, and man, it's a doozy. The disc opens with what was probably his biggest hit, his blowout number for the first Star Wars film, replete with sound effects from the film and swingin' disco beat. Hearing the now-seminal strains of Williams' Star Wars main titles music pumped out over a wah-wah guitar and slammin' dance groove is so deliciously awful that it's good. Real good. This tune alone makes the disc worth a purchase; it's got all the Lucasian embarassment value of the Star Wars Holiday Special But it doesn't quit there! No, Meco takes us on a tour of his music from all FOUR

    60. StarDate Online | Solar System Guide | Asteroids
    Many asteroids resemble peanuts like two chunks of rock that are glued together.Astronomers have discovered thousands of asteroids in our solar system,
    http://stardate.org/resources/ssguide/asteroids.html
    Contact StarDate About StarDate Friends of McDonald Sign up for Sky Tips
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    Asteroids

      The name "asteroid" comes from a Greek word that means "starlike." When seen through a telescope, an asteroid looks like a faint star
      The largest known asteroid, Ceres, was discovered in 1801. It is named from the Roman goddess of agriculture
      Many asteroids resemble peanuts like two chunks of rock that are glued together
    Astronomers have discovered thousands of asteroids in our solar system, and millions more probably await discovery. Still, the mass of all the asteroids combined is less than the mass of the smallest planet, Pluto. Most asteroids lie between Mars and Jupiter, in a vast ring called the Asteroid Belt. But others inhabit different regions of the solar system. The Apollo asteroids, for example, cross or come near Earth's orbit. An Apollo asteroid may have caused the extinction of the dinosaurs when it collided with Earth 65 million years ago. Collisions with similar asteroids may have triggered additional "mass extinctions" on Earth over the last several hundred million years.
    Billions of years ago, when the planets were forming, many large asteroids may have inhabited the asteroid belt. Jupiter's strong gravity prevented these "planetoids" from clumping together to form another planet. Instead, over time, the asteroids crashed into one another and split apart into smaller and smaller fragments. Such collisions occur even now, leaving dust and smaller asteroids in the asteroid belt.

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