(47 Tuc, NGC 104)
(bright globular cluster)
47 Tucane (47 Tuc or NGC 104) is the second
brightest globular cluster in the sky, covering
a region of the celestial sphere approximately
the size of the Sun or Moon,
with an age of 13 gigayears and a low metallicity.
It shows hints of more than one population.
It has more than a million stars and has a very
dense core. Its radius is about 60 ly.
It is an obvious example for the study of globular
clusters and is the subject of searches for
a central black hole and for extra-solar planets.
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