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How are asteroids, comets and meteors different?
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Asteroids Comets and Meteors

AstronomyAstronomy: The scientific study of the Galaxies, Stars, Nebulae, Solar Systems and the Universe. It deals with a celestial objects relationship to the Earth, size, position, composition, motion, evolution and energy. Astronomers use telescopes, satellites, computers, space stations and observatories to study the universe.
Asteroid: A small to large rocky celestial body that circles a star.
Comet: A celestial object with ice at it's nucleus, when it approaches a star it emits a tail of dust particles.
Meteor: A small celestial material that when it enters an atmosphere disintegrates white it leaves a streak of light in the sky.
Science Planetary Science Moon Planets Glossary
Astronomy Solar System Moons Earth Science Glossary
Online Books
Asteroids by Gregory Vogt
Asteroids by Isaac Asimov
Comets by Gregory Vogt
Shapes and Spins of Near-Earth Asteroids
Comets edited by Laurel L Wilkening, Mildred Shapley Matthews
Near-Earth Objects: Finding Them Before They Find Us
Near Earth Objects, Our Celestial Neighbors (IAU S236): Opportunity and Risk
Defending Planet Earth: Near-Earth Object Surveys and Hazard Mitigation ...
NASA Resources NEOWISE Comets Meteors Asteroids Watch the Skies
Online Resources
Wikipedia Asteroids Zoom Astronomy National Geo. Near Earth Asteroid Tracking
Wikipedia Meteors Cool Cosmos Asteroid Asteroid View The Solar System
Wikipedia Comet Space Environment Universe Today Space Doomsday Asteroid
Wikipedia Russia Hit Wiktionary Planetoid Cool Cosmos Zoom Astronomy Asteroid
Scholarly Articles Planetoid NASA Comets NASA Asteroid Facts
NASA Meteors Planets for Kids Comets Comets Sky Telescopes Comets
Hubble Site Wikipedia Meteors Science Daily NEOs Astronomy What is a Meteor Resources
Bus-Size Asteroid ... Buzzes Earth Potentially Dangerous Asteroids Near-Earth Asteroids  
Photos of Asteroids; Space Rocks | Asteroids in Deep Space Near-Earth Objects
Little Known Facts:
1. "Every day, Earth is bombarded with more than 100 tons of dust and sand-sized particles." NASA click here for more facts.
2. "About once a year, an automobile-sized asteroid hits Earth's atmosphere, creates an impressive fireball, and burns up before reaching the surface." NASA click here for more facts.
3. "Every 2,000 years or so, a meteoroid the size of a football field hits Earth and causes significant damage to the area.'' NASA click here for more facts.
4. "Only once every few million years, an object large enough to threaten Earth's civilization comes along. Impact craters on Earth, the moon and other planetary bodies are evidence of these occurrences.'' NASA click here for more facts.
5.''If a rocky meteoroid larger than 25 meters but smaller than one kilometer ( a little more than 1/2 mile) were to hit Earth, it would likely cause local damage to the impact area."NASA click here for more facts.
6. ''The largest asteroid is Ceres, which is 933 kilometers (580 miles) across." Ask and Astronomer click here for more facts
7. "Meteors are the short, white trails across the sky that we call "shooting stars." Ask and Astronomer click here for more facts
8. "Asteroids and comets are considered remnants from the giant cloud of gas and dust that condensed to create the sun, planets, and moons some 4.5 billion years ago." National Geographic click here for more facts
9. "There are LOTS of comets out there. Scientist so far have discovered about 4,000 comets,, and evidence suggests there may be hundreds of millions more -- perhaps trillions." Huffington Post click here for more facts.
10. "All comets orbit the sun.'' Huffington Post click here for more facts.