These cosmic objects--the leftovers of the formation of our solar system--are the most plentiful bodies in that system. Covered in this fact-filled, up-to-date volume are how asteroids were first discovered, how asteroids and comets formed, their sizes, shapes and orbits, ongoing space flights to these bodies, plans no mine them for their valuable materials, and the very real threat of disaster caused by asteroids and comets impacting the earth.
發表於2024-11-24
Comets and Asteroids 2024 pdf epub mobi 電子書 下載
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Comets and Asteroids 2024 pdf epub mobi 電子書 下載