Asteroids, Comets & Meteors - Science@NASA
https://science.nasa.gov/asteroids-comets-meteors/
WEBOverview. Asteroids, 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.
DA: 83 PA: 64 MOZ Rank: 18