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Астронет: Астрономическая картинка дня Миллионы звезд в ω Центавра http://variable-stars.ru/db/msg/1924629/eng |
Credit & Copyright:
Massimo Di Fusco
and Mirco Turra
Explanation:
Globular star cluster
Omega
Centauri,
also known as NGC 5139, is 15,000 light-years away.
The cluster is packed with about 10 million
stars much older than the Sun within a volume about 150 light-years in
diameter.
It's the largest and brightest of 200 or so known
globular clusters that
roam the halo of our Milky Way galaxy.
Though most star clusters consist of stars with the same age and
composition, the enigmatic Omega Cen exhibits the presence of
different
stellar populations with a spread of ages and chemical abundances.
In fact,
Omega Cen may be
the
remnant
core of a small galaxy merging with the Milky Way.
With a yellowish hue,
Omega Centauri's red giant stars are easy to pick out in this
sharp, color telescopic view.
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.