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the star Betelgeuse?

Can you give me some information about the star Betelgeuse? as size, brightness, lifetime, composition, temperature, etc.. or do you have any good websites about astronomy?

reddish-yellow star of first magnitude, forming the eastern in the constellation of Orion the hunter. one of the brightest stars in the sky, which is variable in the light output, rather irregular, fluctuating between magnitudes 0.4 and 1.3 for a period of several hundred days. belongs to the spectral type M2, which means that its surface temperature is about 3,000 C. – Approximately half than our own sun. seems so bright because of its large size – between 300 and 400 times the diameter of the sun but its mass is about 15 times larger than the sun, the incandescent gas consisting of extremely rarefield. has only one millionth of the density of water, or one thousandth of the air. has been called un''vacío''al red. the star lies at a distance of about 270 light years, moving away from Earth at 13 kilometers per second.

The American Space Program: Mercury and Gemini Missions–The Best Websites $7.99 The Mercury Seven: Scott Carpenter, Gordon Cooper, John Glenn, Gus Grissom, Alan Shephard, Wally Schirra, Deke Slayton. The Gemini Crew: Neil Armstrong, Frank Borman, Pete Conrad, Jim Lovell, James McDivitt, Elliott See, Jr. Two of these men will give their lives to the program. One will be grounded. One will become the oldest human to venture into space. One will bring a crippled spacecraf…