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Астронет: Астрономическая картинка дня Огромное шаровое скопление в Геркулесе http://variable-stars.ru/db/msg/1940307/eng |
Credit & Copyright: Jan Beckmann, Julian Zoller,
Lukas Eisert, Wolfgang Hummel
Explanation:
In 1716,
English astronomer
Edmond
Halley
noted, "This is but a little Patch, but it shows itself to the
naked Eye, when the Sky is serene and the Moon absent."
Of course, M13
is now less modestly recognized as the Great Globular Cluster in
Hercules, one of the brightest
globular
star clusters in the northern sky.
Sharp telescopic views like this one
reveal the spectacular cluster's
hundreds
of thousands of stars.
At a distance of 25,000 light-years, the
cluster
stars crowd
into a region 150 light-years in diameter.
Approaching the cluster core,
upwards of 100 stars could be contained
in a cube just 3 light-years on a side.
For comparison, the
closest star to the Sun is over
4 light-years away.
The deep, wide-field image also reveals distant background galaxies
including NGC 6207 at the upper left, and faint, foreground
Milky Way dust clouds known
to some as integrated flux nebulae.
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.