Scientists don't know what is behind the unprecedented brightness of Sagittarius A*.
Since 1992 astronomers have found 4,000 exoplanets, watch this musically animated map to see exactly when and where.
NASA is preparing its Orion spacecraft for lunar orbit.
The researchers say this is a powerful new approach to studying galaxy formation.
Researchers have been developing super-thin, lightweight X-ray mirrors for next-generation X-ray observatories.