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Astronomy Picture of the Day
The M7 Open Star Cluster in Scorpius
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#71378
by
[z]Barbara Harris
@
07.04.2005 00:00
- nach oben -
The M7 Open Star Cluster in Scorpius
Explanation:
M7 is one of the most prominent
open clusters
of stars on the sky.
The cluster, dominated by bright blue
stars
,
can be seen with the naked eye in a dark sky
in the tail of the
constellation
of
Scorpius
.
M7 contains about 100 stars in total,
is about 200 million years old, spans 25
light-years
across, and lies about 1000 light-years away.
This color picture
was taken recently at the
Kitt Peak
National Observatory
in
Arizona
,
USA
as part of the
Advanced Observers Program
.
The
M7 star cluster
has been known since ancient times, being noted by
Ptolemy
in the year 130 AD.
Also visible is a
dark dust cloud
near the bottom of the frame,
and literally millions of unrelated stars
towards the Galactic center
.
Credit & Copyright