Date: 1999 - 2000
What is the closest star to the sun. Some sources say Alpha Centauri
and others say Proxima Centauri is the closest. Both are reliable
is the closest star???
The name "Alpha Centauri" actually denotes a triple star system in the
constellation Centaurus (it appears as a single star to the naked eye).
Two of these stars, denoted Alpha Centauri A and B, are very similar to
the Sun and are approximately 4.336 light-years away. They orbit each
other (better said, they orbit their common center of mass) with a period
of about 80 years. Then, orbiting this pair is a small, faint star only
a tenth the size of the Sun. This star takes one-and-a-half million years
to orbit the larger pair; at the moment it is closer to us than the other
two, a mere 4.205 light-years away. Because it is the nearest star to the
Sun, it is named Proxima (from the Latin word for "nearest") Centauri.
This information came from "Astronomy: The Cosmic Journey", an astronomy
text by William Hartmann. I did not know this stuff myself 'til now!
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Update: June 2012