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
Desktop Images
The Big Chandra Picture
High Res Prints
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:
I still don't understand the fact that all that photos show something expanding in a "circular/planar" situation and not in a "spherical/3D" configuration. Could that be that the circular expansion is a concentration of a spherical explosion seeing sideways--a mere optical effect?

A:
Yes, many of the 2D "rings" are actually 3D expansions that appear as rings because of a phenomenon known as "limb brightening". If the expanding material is in a 3D shell, the telescope will look through more material on the edges of the shell than the center, causing it to appear as a bright ring.

Back | Index