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Астронет: Астрономическая картинка дня Галактика с вспышкой звездообразования М94 http://variable-stars.ru/db/msg/1952895/eng |
Credit & Copyright: ESA/Hubble and
NASA
Explanation:
Beautiful island universe
Messier
94 lies
a mere 15 million light-years
distant in the northern constellation of the hunting dogs,
Canes
Venatici.
A popular target for earth-based astronomers,
the face-on spiral galaxy is about 30,000 light-years across,
with spiral arms sweeping through the
outskirts of its broad disk.
But this Hubble
Space Telescope field of view spans about
7,000 light-years or so across M94's central region.
The sharp close-up examines the galaxy's compact,
bright nucleus and prominent inner dust lanes,
surrounded by a remarkable bluish ring of young,
massive stars.
The massive stars in the ring
appear
to be less than about 10 million
years old, indicating the galaxy experienced a corresponding well-defined
era of rapid star formation.
As a result, while the small, bright nucleus is typical of the
Seyfert
class of active galaxies, M94 is also known as a
starburst galaxy.
Because M94 is relatively nearby, astronomers can explore
in detail
reasons for the galaxy's burst of star formation.
Today's Coverage:
Moon
Landing
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.