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

Q:
I'm mystified by the announcement that the Chandra X-Ray Observatory has imaged sounds waves in Perseus. What medium is modulated? While the waves are reported to be very low frequency, the implication is that there are areas of compression and rarefaction. Of what? The "ether" of space?

A:
There is hot gas in clusters of galaxies (detectable with X-ray telescopes), and this is the medium that the sound travels through. The density of this gas is very low, but as long as there is some continuous medium, then sound is able to pass through it.

Back | Index | Next