Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Ask Astro

Published: December 27, 2010
Sun_1210
The Sun is a star with a diameter of approximately 864,000 miles (1,390,000 kilometers), about 109 times the diameter of Earth. The largest stars have a diameter about 1,000 times that of the Sun.
Photo by NASA/NSSDC
Only one star, HIP 21158 in Taurus, remains a candidate sibling; however, the evidence that this star was born in the same cluster as the Sun is weak.
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