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MWC 922 (Red Square Nebula)


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MWC 922
Planetary Nebula (惑星状星雲)
Red Square Nebula (赤い正方形星雲)
Nb PN

星座 (Constellation)
へび座 (Ser) (Serpens)


距離 (Distance)
5,000光年 (5,000 light-years)

Red Square Nebula (MWC 922) is a planetary nebula located 5,000 light years from the Earth in the constellation Serpens.

MWC 922 (Red Square Nebula) : Picture

MWC 922: The Red Square Nebula
MWC 922: The Red Square Nebula
(C) Peter Tuthill (Sydney U.) & James Lloyd (Cornell)
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.

MWC 922: The Red Square Nebula
MWC 922: The Red Square Nebula
(C) Peter Tuthill (Sydney U.) & James Lloyd (Cornell)
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MWC 922 (Red Square Nebula) : Movie

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