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Astronomers divide stars into five main groups according to their size.They are grouped according to their life span.
1.SupergiantsThey are the largest stars.
Examples are Antares and Betelgeuse.
Antares has a diameter that is 330 times
than the sun. Betelgeuse has a diameter
of 375 to 595 times that of the sun.
2.GiantsThey have diameters that are about 10
to 100 times larger than the sun's. Aldebaran
has a diameter that is 36 times that of the sun.
3. Medium-sized starsThey are as big as the sun. Other stars
in this group are Altair,Sirius,and Rigel.
4.White dwarfsThey are the small stars. The smallest
dwarf is Van Maanin's star. It has a diameter
of 8 370 km,less than the distance across Asia.
5.Neutron StarThey are the tiniest stars. Their mass
is less than that of the sun but are so compact.
Their diameter is about 20 km.
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