Here's how two world powers raced to the moon.
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.
The Wright Brothers’ first plane flight in Kitty Hawk lasted just 12 seconds in 1903, but Orville and Wilbur made history with their Wright Flyer.
The 1903 Wright Flyer that made history's first flight was a relatively simple machine with propellers and wire controls.
Most of the star nearest to Earth are red dwarfs, but they are too dim to be seen with the naked eye.