|
A galaxy is a massive,
gravitationally bound system consisting of stars, stellar remnants,
and interstellar medium of gas and dust, and, it is hypothesized, an
important but poorly understood component called dark matter. The
word galaxy is derived from the Greek galaxias (γαλαξίας), literally
"milky", a reference to the Milky Way. Examples of galaxies range
from dwarfs with as few as ten million stars to giants with a
hundred trillion stars, each orbiting their galaxy's own center of
mass.
There are some types of
galaxies:
|
1
2
3
4
5
6
7
8
9
10
11
12