
Asteroids, Comets & Meteors
Our solar system's small bodies pack big surprises.
Exploring asteroids
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Active Missions
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Mission On Deck
At the Station
Overview
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.
NASA/JPL-Caltech
Asteroids, Comets and Meteors Stories
Asteroid, Comets and Meteors
14 Images
To date, NASA-sponsored surveys have provided over 95% of all Near-Earth Object discoveries.

NASA
Planetary Defense Coordination Office (PDCO)
Resources
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