Friday, 10 June 2011


Arcturus is a red giant, 22 million miles in diameter or 35.7 million Kilometers. which is 25.7 times that of the sun and 2/3 the radius of of Mercury's orbit. Arcturus puts out more than 110 times as much light as the sun and is 36 light years away which is rather close, making it the third brightest star in the sky.

It also scintillates in rather an impressive way: