NASA just announced its first astronauts for commercial crew vehicles. Other entities are courting the companies as well, hoping to bring tourists into space just behind the government astronauts. How close are we to flying tourists?
"Ask a Spaceman" is live for the first time on Facebook — and astrophysicist Paul Sutter jumps right into it with a trip to Pluto.
Water and liquid rubies may exist within the nightside clouds of distant Jupiter-like exoplanets, but they melt in the heat of the planets' scorchingly hot bright sides, according to NASA.
The globular cluster Omega Centauri hosts an estimated 10 million stars, but they may be too tightly packed to hold onto habitable planets, a new study suggests.
Two Russian cosmonauts will conduct a 6-hour spacewalk today (Aug. 15) to launch small satellites and take care of a couple scientific tasks.