Credit & Copyright: Kimberly Sibbald
Explanation:
What powers this unusual nebula?
CTB-1 is the expanding gas shell that was left
when a massive star toward the constellation of
Cassiopeia
exploded about 10,000 years ago.
The star likely detonated when it ran out of elements near its core that could create
stabilizing pressure with
nuclear fusion.
The resulting
supernova remnant, nicknamed the Medulla Nebula for its
brain-like shape, still glows in
visible light by the
heat generated by its collision with confining
interstellar gas.
Why
the nebula also glows in
X-ray light, though,
remains a mystery.
One hypothesis holds that an energetic
pulsar
was co-created that powers the nebula with a fast outwardly moving wind.
Following this lead, a pulsar has
recently been found in
radio waves
that appears to have
been expelled by the
supernova explosion
at over 1000 kilometers per second.
Although the Medulla Nebula appears as large as a
full moon,
it is so faint that it took many hours of exposure
with a telescope in
Seven Persons,
Alberta,
Canada to create the
featured image.
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Publikacii s klyuchevymi slovami:
supernova remnant - ostatok Sverhnovoi
Publikacii so slovami: supernova remnant - ostatok Sverhnovoi | |
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