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Astronomy Picture of the Day
Globular Cluster M22 from CFHT
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#76361
by
[z]Barbara Harris
@
28.06.2005 00:00
- nach oben -
Globular Cluster M22 from CFHT
Explanation: The globular cluster
M22
,
pictured above
, contains over 100,000 stars. These stars formed together and are gravitationally bound. Stars
orbit the center
of the cluster, and the cluster orbits the
center of our Galaxy
. So far, about
140 globular clusters
are known to exist in a roughly spherical halo around the
Galactic center
.
Globular clusters
do not appear spherically distributed as viewed from the Earth, and this fact was a key point in the
determination
that our Sun is not at the center of
our Galaxy
. Globular clusters are very
old
. There is a straightforward method of
determining their age
, and this nearly matches the
13.7 billion-year age
of our
entire universe
.
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