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Astronomy Picture of the Day
Discover the cosmos! Each day we feature a different image or photograph
of our fascinating universe, along with a brief explanation written by a
professional astronomer.
December 30, 1995
LMC X-1: A Black Hole Candidate
Credit:
ROSAT,
MPE,
NASA
Explanation:
The strongest source of X-rays in the
Large Magellanic Cloud originates
from an unusually energetic
binary star system. This strong source, dubbed
LMC X-1, is thought to be a normal and compact star orbiting each other.
Gas stripped of the normal star
falls onto the compact star, heats up, and
emits X-rays. The X-rays shining from the system knock electrons off atoms
for light years around, causing some atoms to glow noticeably in X-rays
when the electrons re-combine. Motion in the binary system indicates the
compact star is probably a
black hole, since its high mass -
roughly five times that of our
Sun -
should be enough to cause even a
neutron star to implode.
Tomorrow's picture: The X-ray Sources of M31
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Authors & editors:
Robert Nemiroff
(GMU) &
Jerry
Bonnell (USRA).
NASA Technical Rep.:
Sherri
Calvo.
Specific rights apply.
A service of:
LHEA
at
NASA/
GSFC