ASTEROIDS
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Zoom Astronomy ASTEROIDS |
| Introduction | Near-Earth Asteroids (NEA) |
Asteroids and Dinosaurs | List of Some Asteroids | Composition | Activities, Web Links |
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| Composition of Asteroids |  |
| Type | Composition | Percentage of Asteroids | Albedo (reflectivity) |
|---|---|---|---|
| Carbon (C-type) | Carbon | over 75 percent | 0.03-0.09 (Very dark) |
| Silicate (S-type) | Metallic iron mixed with iron-silicates and magnesium-silicates | 17 percent | 0.10 -0.22 (Relatively bright) |
| Metallic (M-type) | Iron/ nickel | less than 7 percent | 0.10-0.18 (Relatively bright) |
| Dark (D-type) | Water ice/frozen carbon monoxide mixed with rock | less than 1 percent | 0.05 (Relatively dark and reddish) |
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