Samples of three carbonaceous chondrite meteorites that fell to Earth.
Carbonaceous chondrites contain many of the building blocks of life.
Sample of Yukon meteor that exploded over Yukon Territory, Canada, on Jan. 18, 2000. Murchison meteorite sample, which fell to Earth in Australia in 1969. Samples of the Yukon meteorite are being analyzed at NASA's Johnson Space Center at the request of the Geological Survey of Canada, Natural Resources Canada, which has borrowed them from the finder.