Whats the difference between a comet and a planet?
You’re talking about Comet Holmes, which you can read all about here http://en.wikipedia.org/wiki/17P/Holmes The comet itself is not bigger than the sun, it’s the comet’s coma which has spread out to be bigger than the sun. The comet itself is tiny, only a few miles across. “In astronomy, the nebulous envelope around the nucleus of a comet is called its coma (from the Latin word for “hair”). It is formed when the comet passes close to the sun on its highly elliptical orbit; as the comet warms, parts of it sublimate. The coma is generally made of ice and dust. Larger dust particles are left along the comet’s orbital path while smaller particles are pushed away from the Sun into the comet’s tail by light pressure [1]. This gives a comet a “fuzzy” appearance when viewed in telescopes and distinguishes it from stars. Stardust was a NASA mission to recover samples of a comet’s coma.” Comets travel much faster than planets,
