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Астронет: Астрономическая картинка дня Мессье 81 http://variable-stars.ru/db/msg/1466641/eng |
Credit & Copyright: Paolo De
Salvatore (Zenit Observatory)
Explanation:
One of the brightest galaxies in planet Earth's sky is similar in size
to our Milky Way Galaxy: big,
beautiful
Messier 81.
Also known as NGC 3031 or Bode's galaxy for its 18th century discoverer,
this
grand spiral can be found toward
the northern constellation of Ursa Major, the Great Bear.
The
detailed telescopic view reveals M81's bright yellow nucleus, blue
spiral arms, pink starforming regions, and sweeping
cosmic dust lanes.
Some dust lanes actually run through the galactic disk (left of center),
contrary to other prominent
spiral features though.
The errant dust lanes may be the lingering result
of a close encounter between M81
and its smaller companion galaxy, M82.
Scrutiny of variable stars in M81 has yielded one of the best
determined
distances for an external galaxy -- 11.8 million light-years.
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.