by APOD Robot » Sun Sep 26, 2021 4:05 am
The Red Square Nebula
Explanation: How did a round star create this square nebula? No one is quite sure. The round star, known as MWC 922 and possibly part of a
multiple star system, appears at the center of the
Red Square Nebula. The
featured 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.
[url=https://apod.nasa.gov/apod/ap210926.html] [img]https://apod.nasa.gov/apod/calendar/S_210926.jpg[/img] [size=150]The Red Square Nebula[/size][/url]
[b] Explanation: [/b] How did a round star create this square nebula? No one is quite sure. The round star, known as MWC 922 and possibly part of a [url=https://imagine.gsfc.nasa.gov/ask_astro/binary.html]multiple star system[/url], appears at the center of the [url=http://en.wikipedia.org/wiki/Red_Square_Nebula]Red Square Nebula[/url]. The [url=http://www.physics.usyd.edu.au/~gekko/redsquare.html]featured image[/url] combines [url=https://science.nasa.gov/ems/07_infraredwaves]infrared[/url] exposures from the [url=https://sites.astro.caltech.edu/palomar/about/telescopes/hale.html]Hale Telescope[/url] on [url=https://sites.astro.caltech.edu/palomar/homepage.html]Mt. Palomar[/url] in [url=https://en.wikipedia.org/wiki/California]California[/url], and the [url=https://apod.nasa.gov/apod/ap971227.html]Keck-2 Telescope[/url] on [url=https://apod.nasa.gov/apod/ap050704.html]Mauna Kea[/url] in [url=https://en.wikipedia.org/wiki/Hawaii]Hawaii[/url]. A leading progenitor hypothesis for the [url=https://apod.nasa.gov/apod/ap170108.html]square nebula[/url] is that the central [url=https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve/]star[/url] or stars somehow expelled cones of gas during a late [url=http://www.youtube.com/watch?v=W13ZYepDBvo]developmental stage[/url]. For [url=https://ui.adsabs.harvard.edu/abs/2019A%26A...629A.136S/abstract]MWC 922[/url], these cones happen to incorporate nearly [url=https://en.wikipedia.org/wiki/Right_angle]right angles[/url] and be visible from the sides. Supporting evidence for the [url=https://mathworld.wolfram.com/Cone.html]cone[/url] hypothesis includes radial spokes in the image that might run along the [url=https://www.boredpanda.com/blog/wp-content/uploads/2020/06/5ed9ec69e62b1_9wun41kj45n01-png__700.jpg]cone[/url] walls. Researchers speculate that the [url=https://apod.nasa.gov/apod/ap130521.html]cones[/url] viewed from another angle would appear similar to the gigantic rings of [url=https://apod.nasa.gov/apod/ap070107.html]supernova 1987A[/url], possibly indicating that a star in MWC 922 might one day itself explode in a similar [url=http://heasarc.gsfc.nasa.gov/docs/snr.html]supernova[/url].
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