Asteroids, Comets & Meteors - NASA Science
https://science.nasa.gov/asteroids-comets-meteors/
WebAsteroids, comets, and meteors are chunks of rock, ice, and metal left over from the formation of our solar system 4.6 billion years ago. They are a lot like a fossil record of our early solar system. There are currently about 1.3 million known asteroids, and more than 3,800 known comets.
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