How Do Stars Move through the Galaxy

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200 pc

5 pc

Sagittarius A* - Sgr A*

Slide 28

Stellar Motion

Infrared images of stars in the Galactic Center over 8 years.

The “+” is the radio source Sgr A*

Conclusion: Must be over one million solar masses within less than 1/5 of a light year!

Supermassive Black Hole!

Event Horizon < 0.05 AU!

Probably in the centers of all spiral galaxies.

Copyright Eckart & Genzel