Credit & Copyright: H. Bond (STScI),
A. Henden (USNO Flagstaff),
Z. Levay (STScI), et al.,
ESA,
NASA
Explanation:
What caused this outburst of V838 Mon?
For reasons unknown, star V838 Mon's
outer surface suddenly greatly expanded with the
result that it became the brightest star in the entire
Milky Way Galaxy.
Then, just as suddenly, it faded.
A stellar flash like this has never been seen before --
supernovas
and novas expel matter out into space.
Although the V838 Mon flash appears to expel material into space, what is seen in the
above four-frame movie is actually an outwardly moving
light echo of the bright flash.
The actual time-span of the movie is 8 months during 2002.
In a light echo, light from the flash is reflected by successively more distant rings
in the complex array of ambient
interstellar dust
that already surrounded the star.
V838 Mon lies about 20,000
light years away toward the
constellation of
Monoceros, while the largest light echo above spans about
six light years in diameter.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
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