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Астронет: Астрономическая картинка дня NGC 2261: Переменная туманность Хаббла http://variable-stars.ru/db/msg/1162823/eng |
Credit & Copyright: William Sparks (STScI),
Sylvia Baggett (STScI) et al.,
& the Hubble Heritage Team (AURA/ STScI/ NASA)
Explanation:
What causes Hubble's Variable Nebula to vary?
The unusual nebula pictured above
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 earlier this century.
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 Monocerotis.
A 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.
& the Hubble Heritage Team (AURA/ STScI/ NASA)
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.