posted on Dec, 16 2012 @ 12:42 PM
Today, in APOD
, there's an extraordinary picture that shows an unusual square nebula.
What could cause a nebula to appear square? No one is quite sure.
The hot star system known as MWC 922, however, appears to be embedded in a nebula with just such a shape. The above image combines infrared exposures
from the Hale Telescope on Mt. Palomar in California, and the Keck-2 Telescope on Mauna Kea in Hawaii.
A leading progenitor hypothesis for the square nebula is that the central star or stars somehow expelled cones of gas during a late developmental
stage. For MWC 922, these cones happen to incorporate nearly right angles and be visible from the sides.
Supporting evidence for the cone hypothesis includes radial spokes in the image that might run along the cone walls.
Researchers speculate that the cones viewed from another angle would appear similar to the gigantic rings of supernova 1987A, possibly indicating that
a star in MWC 922 might one day itself explode in a similar supernova.
Original Source (with great explanations and animated GIFs): Physics Usyd
edit on 16-12-2012 by elevenaugust because: (no reason given)