Chris Impey is a professor of Astronomy at the University of Arizona. He has over 180 refereed publications on observational cosmology, galaxies, and quasars, and his research has been supported by $20 million in NASA and NSF grants.
After a journey of seven years and nearly 4 billion miles, NASA's OSIRIS-REx spacecraft landed gently in the Utah desert on the morning of Sept. 24, 2023, with a precious payload. The spacecraft brought back a sample from the asteroid Bennu.
The first extraterrestrial material returned to Earth came from the Apollo program. Between 1969 and 1972, six Apollo missions brought back 842 pounds of lunar samples. Some space rocks are freeSome space rocks cost nothing. Almost 50 tons of free samples from the solar system rain down on the Earth every day. Most burn up in the atmosphere, but if they reach the ground they're called meteorites, and most of those come from asteroids.
More than a few meteorites have reached us from the Moon and Mars. Close to 600 have been recognized as coming from the Moon, and the largest, weighing 4 pounds , sold for a price that works out to be about $4,700 per ounce . Expensive elements and mineralsSome elements and minerals are expensive because they’re scarce. Simple elements in the periodic table have low prices. Per ounce, carbon costs one-third of a cent, iron costs 1 cent, aluminum costs 56 cents, and even mercury is less than a dollar . Silver is $14 per ounce , and gold, $1,900 per ounce .
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