Astronomy

« Previous Entries Next Entries »

What is a galaxy?

Wednesday, May 21st, 2008

A galaxy is a massive collection of stars gravitationally bound around a common central core. It is believed that most, if not all galaxies have at their core a super massive black hole - a black hole coming in at hundreds of thousands or billions times more massive than our own Sun.
Speaking of our own [...]

« Previous Entries Next Entries »