2. Important Facts
• 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. Orbit
Tars and gases at a wide range of distances
from the Galactic center orbit at
approximately 220 kilometers per second.
5. Rotation
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. Revolution
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.