Credit & Copyright: Vikas Chander
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, above and right 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.
Too faint to be seen by the unaided eye, it almost covers the
area of a full moon in planet Earth's sky.
Open star cluster M21 just peeks into this telescopic field of view
along the bottom right edge of the frame.
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M 20 - Trifid nebula - Trehrazdel'naya tumannost'
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