How Big Is Betelgeuse?

Answer

Betelgeuse is the second brightest star in the Orion constellation. It measures over 600 million miles in diameter. That is approximately 1,000 times the size of the sun. You can find more information here: http://www.enchantedlearning.com/subjects/astronomy/glossary/indexb.shtml
Q&A Related to "How Big Is Betelgeuse"
Betelgeuse is a red supergiant, and one of the largest and most luminous stars known, but not the largest - see related question. It has a radius 936 times larger than our own Sun
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It will definitely be a big event, easily the brightest supernova ever (due to it's distance of 640 LY) but getting brighter than a full moon would be hard. But if it came anywhere
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Astronomers can find stars because of their luminosity. This is the total amount of light coming from the star. Of course, the further away a star is, the dimmer it will look from
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You mean how did we find their faint companions? In some cases it was visually, such as with Sirius. In other cases, they were discovered using spectroscopy. The primary stars spectrum
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1 Additional Answer
Betelgeuse is a red supergiant, and for a time, it was the largest known star. Because it is large and unstable, Betelgeuse's diameter has been measured anywhere from 16 AU to 35 AU. You can find more information here: http://www.solstation.com/x-objects/betelgeuse.htm
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