Astronauts exploring the moon will need all the help they can get, and scientists have spent lots of time and plenty of money coming up with different systems to do

Galaxy clusters are among the largest structures in our universe, consisting of hundreds or thousands of galaxies that have become gravitationally bound together over billions of years. Astrophysicists have long

We usually think of satellites as small objects orbiting planets or stars. But in the broader universe, galaxies themselves can have satellites—smaller galaxies bound by gravity that orbit a larger

Rich with detail, the spiral galaxy NGC 1309 shines in this NASA/ESA Hubble Space Telescope image. NGC 1309 is about 100 million light-years away in the constellation Eridanus.

Black holes are massive, strange and incredibly powerful astronomical objects. Scientists know that supermassive black holes reside in the centers of most galaxies.

While NASA maintains the lead in human space exploration, other nations have already begun their own projects. Take the China National Space Agency, for example, with their CLEP, or Chinese