Are sample-return missions the only way to obtain extraterrestrial samples?

  1. 2 years ago


    8 Jul 2016 Administrator
    Edited 2 years ago by BenDryer

    No. Each year, stones from interplanetary space of all size, from microscopic to many meters in diameter, rain down on Earth. Their rapid entries in our atmosphere are marked by fiery phenomena known as meteors or shooting stars, and surviving fragments impacting the ground are called meteorites. Meteorites have been studied for more than two centuries, most of them originating from asteroids, some likely from comets, with rare samples from Mars and the Moon having also been recognized.


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