Exploring the Milky Way Galaxy

Front

Milky Way Galaxy Type

Back

Barred Spiral

Front

Approximate Diameter

Back

100,000 light-years

Front

Number of Stars

Back

100-400 billion

Front

Central Black Hole

Back

Sagittarius A*

Front

Age of the Milky Way

Back

13.6 billion years

Front

Solar System's Location

Back

Orion Arm

Front

Galactic Year

Back

225-250 million Earth years

Front

Nearest Galaxy

Back

Andromeda

Front

Milky Way's Mass

Back

1.5 × 10^12 solar masses

Front

Number of Spiral Arms

Back

4 major arms