SPACE.com invites experts in space exploration, science & technology to provide insightful commentary and informed perspective on news, current events, innovations, big ideas and ongoing research. Expert Voices includes Op-Ed analysis and opinion as well as interesting observations from the field and space exploration efforts around the world.
The surface of Mars, with its dune flows, gullies and slope movements, is the result of sediment being transported downwards in the recent past as well as today.
Despite very considerable successes, there remains much more to be learned. And in some ways, the discoveries made in recent decades have raised as many new questions as they have answered.
The short answer is that most satellites don't come back to Earth at all. Most of them burn to a crisp before they get anywhere near the ground.
This challenges the history of astronomy and tells us that Aboriginal Australians were even more careful observers of the night sky than they have been given credit for.
Producers and directors may think that science is only exciting when it is science fiction, but the truth is almost always stranger (and more interesting) than fiction.
Art and science are often seen as complete opposites: art is subjective, while science aims to discover objective facts about nature.
Star Trek is set in space. At its very heart, it aims to be a story of exploration, of advancing knowledge, of science.
The dream of a human habitat in orbit about the moon came a step closer on September 27, when NASA and the Russian space agency (Roscosmos) signed up to a common vision for future human exploration.
Will we someday colonize space? Will our children visit other planets? To achieve goals like these, we’ll need to crack one crucial challenge: how to feed ourselves for long periods away from Earth.
Former NASA astronaut Leroy Chiao may have commanded a real-life space station, but "Star Trek" gave him an early push.