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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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