An overview of the Chandra mission and goals, Chandra's namesake, top 10 facts.
Classroom activities, printable materials, interactive games & more.
Overview of X-ray Astronomy and X-ray sources: black holes to galaxy clusters.
All Chandra images released to the public listed by date & by category
Current Chandra press releases, status reports, interviews & biographies.
A collection of multimedia, illustrations & animations, a glossary, FAQ & more.
A collection of illustrations, animations and video.
Chandra discoveries in an audio/video format.
Q&A: Milky Way Galaxy

Q:
How do we know there's a supermassive black hole in the center of the Milky Way?

A:

Chandra Image of Sagittarius A*

Animation of Sagittarius A*
Astronomers have used careful observations of the motions of stars around the center of our Galaxy to make inferences about the mass of the object that lies at the center. They have concluded that these stars orbit a dark massive body, with a mass approximately 3 million times that of the Sun. The only known object that could be so massive and still be dark is a supermassive black hole.

The Milky Way galaxy's supermassive black hole, also known as Sagittarius A* (Sgr A*), is located in the center of this image (right). Chandra's observations have shown that flares from the black hole are very common. The cause of these flares is not understood, but they are thought to occur near the event horizon, or point of no return, around the black hole.

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