How do you know the sun didn't just explode? We aren't talking about the everyday, run-of-the-mill controlled explosion the sun is always doing, but a big boom.
Astronauts cannot use conventional pens and pencils in outerspace. Here's why:
Can astronauts hibernate during space travel to cut down on needed supplies and lighten their cargo?
Data from the Rosetta mission, the Mars rover and the Herschel space observatory point to water's extraterrestrial origins.
*Beware of alarmist headlines. The odds are slim when it comes to giant Earth-bound asteroids.
Bacterial spores, lichens and plant seeds were exposed to outer space conditions for 18 months, and lived to tell about it!
Scientists have a new estimate for the geological age of one of Mercury's oldest regions.
NASA's Curiosity rover has found evidence for life-supporting conditions on ancient Mars.
The Kepler space telescope has shown us that we live in a galaxy full of Earth-sized planets.