2. There are more than 200 billion stars in
Milky Way Galaxy
 The largest neighboring galaxy to Milky
Way galaxy is the Andromeda Galaxy
 The oldest star in Milky Way Galaxy is
13.2 billion years old which is almost
same as old as the universe
 The diameter of Milky Way Galaxy is
100,000 light years
 There are black holes in Milky Way
Galaxy


3. Tars and gases at a wide range of
distances from the Galactic center
orbit at approximately 220
kilometers per second.

5. Yes, this rate of rotation means that the
Solar System – which is 28,000 light years
from the center of the Milky Way –
completely orbits the galaxy about every
225 million years.

6. The galactic year, also known as a cosmic
year, is the duration of time required for the
Solar System to orbit once around the
center of the Milky Way Galaxy.[1]
Estimates of the length of one orbit range
from 225 to 250 million "terrestrial" years.

7. There are gravitational forces
between every particle of mass in
the universe and every
other particle of mass.