|
Credit & Copyright: Changsu Choi & Myungshin Im
(Seoul National University)
Explanation:
Sit back and watch a star explode.
The actual supernova occurred back when
dinosaurs roamed the Earth,
but images of the spectacular event began arriving last year.
Supernova 2015F was discovered in nearby spiral galaxy
NGC 2442 by
Berto Monard
in 2015 March and was unusually bright -- enough to be seen with only a small telescope.
The pattern of brightness variation indicated a
Type Ia supernova --
a type of stellar explosion that results when an Earth-size
white dwarf
gains so much mass that its core crosses the threshold of
nuclear fusion,
possibly caused by a lower mass
white-dwarf companion spiraling into it.
Finding and tracking Type Ia
supernovae are particularly important because their intrinsic brightness can
be calibrated,
making their
apparent brightness
a good measure of their distance -- and hence useful toward calibrating the
distance scale of the
entire universe.
The featured video tracked
the
stellar disruption
from before explosion images arrived, as it brightened,
and for several months as the
fission-powered supernova glow faded.
The remnants of
SN2015F are now too dim
to see without a large telescope.
Just yesterday, however, the night sky lit up
once again, this time
with an
even brighter supernova
in an even closer galaxy:
Centaurus A.
|
January February March April May June July August September October November December |
| ||||||||||||||||||||||||||||||||||||||||||||||||
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: supernova
Publications with words: supernova
See also:
- APOD: 2023 October 11 Á NGC 1097: Spiral Galaxy with Supernova
- APOD: 2023 July 9 Á Doomed Star Eta Carinae
- APOD: 2023 May 22 Á Supernova Discovered in Nearby Spiral Galaxy M101
- Supernova Cannon Expels Pulsar J0002
- SN Requiem: A Supernova Seen Three Times So Far
- NGC 7814: Little Sombrero with Supernova
- Supernova in NGC 2525