symmetrical nebula

On Apr 19, 6:46 am, Sam Wormley wrote:
boson boss wrote:
http://www.space.com/scienceastronom...al_nebula.html

(in astronomy probably symmetricular nebulosity :-)

See:http://antwrp.gsfc.nasa.gov/apod/ap070416.html
http://antwrp.gsfc.nasa.gov/apod/ima...re_tuthill.jpg

Explanation: 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 imbedded 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.

See:http://antwrp.gsfc.nasa.gov/apod/ap070416.html



There appear many other objects that seem to explode in halves?