New Articles

March 15, 2011

Hone your galaxy-hunting skills

When ancient astronomers saw dark spots on the moon, they thought they were seas. Astronauts Neil Armstrong and Buzz Aldrin discovered something different when they landed in a dark spot named the Sea of Tranquility in 1969. Instead of a sea, the pair uncovered a large lava plane, evidence of an asteroid striking the moon, punching through its center and causing magma to flow up to fill the deep crevice.

Related content

Comments

Editor's Choice Videos