In the darkness of Mercury’s long night, astronomers have detected a faint sodium glow trailing millions of kilometers behind ...

"We do not have a single sample, in the form of a meteorite, from Mercury and Venus," Yap tells Universe Today. "The building blocks of both planets are derived from the innermost solar system ...

As a member of NASA’s original Mercury 7 astronauts in the early days of the Space Race, Shepard became the first American and second human in space. Related Articles How Stanford grad helped or ...