For astronauts living at the International Space Station, money is practically useless. There's nowhere to spend it. Instead astronauts developed a functioning barter economy.
The test was for NASA's Space Launch System, a successor to the retired Space Shuttle program. It takes eight minutes to generate the power needed to get to space, and ultimately to the moon.
The command, a new department of the Air Force, has selected an Army installation in Huntsville as the most-desired location for its future headquarters.
All large galaxies are suspected to have supermassive black holes at their centers. But recently scientists found one distant galaxy, which is seemingly missing its black hole.
Before scientists were even sure black holes existed, an Indian astrophysicist did the math behind Einstein's predictions of what would happen if two black holes collided.
This has been a tough year for pretty much everyone on Earth. But things have been going much better in space. One of the big milestone was for NASA and the commercial company SpaceX.
For the past 65 years, the North American Aerospace Defense Command has made sure that Santa Claus' Christmas Eve goes smoothly. This year, it received support from U.S. Space Command.
NASA announced 18 astronauts who will start training for the next moon mission. The mission will include the first woman to land on the moon in NASA's push for gender equality.
On Monday evening, Jupiter and Saturn appeared closer to each other in the sky than they have for hundreds of years in what has become known as the Great Conjunction.
The two planets will appear to converge into one bright star, that people call the Christmas Star. The last time the planets got this close was almost 400 years ago.