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Астронет: Астрономическая картинка дня Прекрасная Трехраздельная туманность http://variable-stars.ru/db/msg/1753782/eng |
Credit & Copyright: Mike Selby
Explanation:
The beautiful Trifid Nebula
is a cosmic
study in contrasts.
Also known as M20, it lies about
5,000
light-years away toward the nebula rich
constellation Sagittarius.
A star forming region in the plane of our galaxy,
the Trifid does illustrate three different types of
astronomical nebulae;
red emission nebulae dominated by
light from hydrogen atoms,
blue reflection nebulae produced
by dust reflecting starlight, and
dark nebulae where
dense dust clouds appear in silhouette.
But the red emission region roughly separated into three
parts by obscuring dust lanes is what lends the Trifid its
popular name.
Pillars and jets sculpted by newborn stars, below and left of
the emission nebula's center, appear in famous Hubble Space Telescope
close-up
images of the region.
The Trifid Nebula is about 40 light-years across.
Just too faint to be seen by the unaided eye, it almost covers the
area of a full moon in planet Earth's sky.
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.