If you’ve ever looked up at the stars and wondered what’s out there or if you’ve ever fallen into a 2 a.m. Google hole about ...

Mount Everest's "death zone" begins at 26,247 feet and stretches until its summit. Here's what happens to your mind and body, according to those who climbed it.

The physical facts modest cargo bay, limited mass to orbit ... runway-landing testbed looks less like an outlier and more like a prudent hedge. The 1967 Outer Space Treaty bans weapons of mass ...

Laika was the first animal to orbit Earth. Learn why she was chosen, how she was trained, and how her historic 1957 mission helped shape human space travel.

As a joke, she labelled it LGM 1 for “Little Green Men”, but the astronomers working on it did not really believe they had ...