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Астронет: Астрономическая картинка дня NGC 2261: переменная туманность Хаббла http://variable-stars.ru/db/msg/1391959/eng |
Credit & Copyright: Hubble,
NASA,
ESA;
Data: Mark Clampin
(NASA's GSFC);
Processing &
License:
Judy Schmidt
Explanation:
What causes Hubble's Variable Nebula to vary?
The unusual nebula featured here changes its appearance noticeably in just a few weeks.
Discovered over 200 years ago and subsequently
cataloged as NGC 2661,
the remarkable nebula is named for
Edwin Hubble, who
studied it
early last century.
Fitting, perhaps, the
featured image was taken by another namesake of Hubble: the
Space Telescope.
Hubble's Variable Nebula is
a
reflection nebula
made of gas and fine
dust fanning out from the star
R Monocerotis.
The faint nebula is about one
light-year across and lies about 2500 light-years away towards the
constellation of the
Unicorn
(Monocerotis).
The leading
variability explanation for
Hubble's Variable Nebula holds that dense knots
of opaque dust pass close to
R Mon and cast
moving shadows onto the reflecting dust seen in the rest
of
the nebula.
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Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
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rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.