Thursday, July 31, 2008
IC 4406: A Seemingly Square Nebula
Credit: C. R. O'Dell (Vanderbilt U.) et al.,
Hubble Heritage Team, NASA
Explanation: How can a round star make a square nebula?
This conundrum comes to light when studying
planetary nebulae like IC 4406. Evidence indicates that
IC 4406 is likely a hollow cylinder, with its square appearance the result of our vantage point in viewing the
cylinder from the side. Were IC 4406
viewed from the top, it would likely look similar to the Ring Nebula. This representative-color picture is a composite made by combining images taken by the Hubble Space Telescope in 2001 and 2002. Hot gas flows out the ends of the cylinder, while filaments of dark dust and molecular gas lace the bounding walls. The star primarily responsible for this interstellar sculpture can be found in the planetary nebula's center. In a few million years, the only thing left visible in IC 4406 will be a fading white dwarf star.
Listed below are links to blogs that reference this entry: APOD: Square Nebula.
TrackBack URL for this entry: http://www.solomonia.com/cgi-bin/mt4/mt-renamedtb.cgi/15246
, p.73
Leave a comment to: APOD: Square Nebula
Subscribe to This Thread Without Leaving a Comment
Comment Info and Policy:
1) You must have Javascript enabled in your browser in order to comment (blame the spammers). If you don't know what that is, you're probably fine.
2) HTML is on, so basic html should work. Raw links will be made auto-clickable, too, so even if you don't know html you can just paste in the link and it should work fine. Keep the "http://" in it.
3) Comments are generally unmoderated, which means I don't necessarily agree with the tone and tenor of everything posted. In fact, sometimes people post things they don't really mean just to make other people look bad. The internet is an anonymous place for the most part. That said...
4) I welcome you to post here. I'd love to have your input, agree, disagree or just offer a different data point, really. If I didn't want any participation, I'd turn off comments. Be aware, however, that this blog and the comments section exist for my entertainment. Therefore, I reserve ALL RIGHTS here, including the right to remove any or all comments on nothing more than a whim. Please don't even bother complaining. I'm the one providing the space and the free news and thought buffet. I don't owe anyone anything.
Anyone who posts here will be treated as my guest. That means I'm happy to be polite as a default, but if anyone is rude to the host they'll be unceremoniously shown the door.
It may pay to recall a famous line from the Tom Selleck magnum opus, Mr. Baseball: "Jack-san, you want Yoji's advice about the babes, you come to Yoji with respect."
5) Enjoy your stay!