Resources
Q & A
Glossary
Acronym Guide
Further Reading
Outside the Site
Google Sky
WWT
Facebook
Youtube
Twitter
Flickr
Pinterest
Multimedia, Etc
Images/Illustrations
Animation & Video
Special Features
Chandra Podcasts
Desktop Images
The Big Chandra Picture
Presentations
Handouts
Screen Savers
Audio
Web Shortcuts
Chandra Blog
RSS Feed
Chronicle
Email Newsletter
News & Noteworthy
Image Use Policy
Questions & Answers
Glossary of Terms
Download Guide
Get Adobe Reader
Q&A: General Astronomy and Space Science

Q:
How long would it take for scientists to notice the effects of the NGC 6240 merger in our galaxy and/or in other galaxies?

A:
In the case of NGC 6240, the predicted merger of supermassive black holes has likely already occurred, perhaps 250 million years ago in NGC 6240 time. But we won't know about it for another 150 million years! See the discussion and time line at
http://chandra.harvard.edu/photo/cosmic_lookback.html

The changes in the distance between points due to the gravitational waves from a distant black hole merger will be so small that it will take an extremely sensitive detector to measure them.

For more about gravitational wave detectors,
http://www.ligo.caltech.edu/
http://lisa.nasa.gov
Previous | Index | Next