Transcript for scene 39 of the video " The Incredible Experience vs Ice Age - part 2" by Rolf Witzsche  

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Antares-A is 300 million kilometers in diameter

Antares-A is 300 million kilometers in diameter. Its huge size dwarves the Sun, but, because of its low surface temperature of 3,400 degrees, as an inactive star, the giant star is only 10,000 times as luminous as the Sun, with a dim red hue, instead of the millions of times greater luminosity that it might have once had as an active star.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche