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: Black Holes

Q:
NGC 6240
Regarding the recently publicized discovery of two black holes in the same galaxy: I wonder if the gravitational waves expected to be generated by these objects have already reached Earth? How fast do gravitational waves travel?

A:
No, the gravitational waves anticipated from the merger of two black holes in NGC 6240 have not yet reached Earth. Electromagnetic waves and gravitational waves travel at the same speed - the speed of light.

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