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发帖数: 1994 | 1 Cas A Supernova Remnant in X-Rays
Credit: John Hughes et al. (Rutgers), NASA / CXC / SAO
Explanation: The complex shell of a star seen to explode 300 years ago is helping
astronomers to understand how that star exploded. This Chandra Observatory image of
supernova remnant Cassiopeia A (Cas A) shows unprecedented detail in three x-ray colors.
The relationship between brightness, color, and position of material in the image indicates
where in the star this material was just before the | s*****t
发帖数: 1994 | 2 Semeis 147: Supernova Remnant
Credit & Copyright: Steve Mandel
Explanation: It's easy to get lost following the intricate filaments in this stunningly detailed
image of faint supernova remnant Simeis 147. Seen towards the constellation Taurus it
covers nearly 3 degrees (6 full moons) on the sky corresponding to a width of 150 light-years
at the stellar debris cloud's estimated distance of 3,000 light-years. On three separate nights
in December 2001 and January 2002 astronomer | s*****t
发帖数: 1994 | 3 X-Rays From Tycho's Supernova Remnant
Credit: SAO, CXC, NASA
Explanation: In 1572, Danish astronomer Tycho Brahe recorded the sudden appearance of
a bright new star in the constellation Cassiopeia. The new star faded from view over a period
of months and is believed to have been a supernova, one of the last stellar explosions seen in
our Milky Way galaxy. Now known as Tycho's Supernova Remnant, the expanding debris
cloud is shown in this detailed false-color x-ray image fro | s*****t
发帖数: 1994 | 4 Galactic Supernova Remnant IC 443
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
Explanation: About 8000 years ago, a star in our Galaxy exploded. Ancient humans might
have noticed the supernova as a temporary star, but modern humans can see the expanding
shell of gas even today. Pictured above, part of the shell of IC 443 is seen to be composed of
complex filaments, some of which are impacting an existing molecular cloud. Here emission
from shock-excited molecu |
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