What's hidden in the light?
Scott Kelly clocked 340 consecutive days in space and 520 days in space total during his career as a NASA astronaut.
Elon Musk is an entrepreneur best known in space circles for launching SpaceX, the first private company to ship cargo to the International Space Station.
Are you worried about the sun suddenly blinking out? Never fear — our star still has billions of years left to shine.
Roughly 80% of the mass of the universe is made up of dark matter, a material that scientists cannot directly observe. So why do scientists think it dominates?
Five decades after the first moon landing, there are still people who think the whole thing never happened.
NASA’s future flagship telescope, WFIRST, will help us find potentially habitable exoplanets and study a mysterious phenomenon called dark matter.
Black holes are mysterious objects of extreme density, with such strong gravitational attraction that even light cannot escape from their grasp if it comes near enough.
String theory started as a simplification of everything, but has become increasingly complex over the years.