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Астронет: Астрономическая картинка дня Остаток сверхновой Кассиопея А http://variable-stars.ru/db/msg/1914341/eng |
Credit & Copyright: NASA,
ESA,
CSA,
STScI;
D. Milisavljevic (Purdue University),
T. Temim (Princeton University),
I. De Looze (University of Gent)
Explanation:
Massive stars
in our Milky Way Galaxy live spectacular lives.
Collapsing from vast cosmic clouds, their nuclear furnaces
ignite and create heavy elements in their cores.
After only a few million years for the most massive stars, the
enriched material is blasted
back into interstellar space where star formation can begin anew.
The expanding debris cloud known as Cassiopeia A is an example
of this final phase of the
stellar life cycle.
Light from the supernova explosion that created this remnant
would have been first
seen in planet Earth's sky
about 350 years ago,
although it took that light 11,000 years to reach us.
This
sharp NIRCam image
from the James Webb Space Telescope
shows the still hot filaments and knots in the supernova remnant.
The whitish, smoke-like outer shell of the expanding blast wave
is about 20 light-years across, while the
bright speck
near center is a neutron star,
the incredibly dense, collapsed remains of the massive stellar core.
Light echoes from the massive star's cataclysmic explosion are also
identified
in Webb's detailed image
of supernova remnant Cassiopeia A.
Tonight watch:
The
Geminids
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.