PC Pals Forum
General Discussion => Science & Nature => Topic started by: sam on December 08, 2009, 01:36
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Like everything else in the Universe, stars get old. As they become older, stars like our own Sun "puff up", becoming red giants for a period before finally settling down into white dwarfs. During this late period of their stellar lives, about 30% of low-mass red giants exhibit a curious variability in their brightness that remains unexplained to this day. A new survey of these types of red giants rules out most of the current explanations put forth, making it necessary to find a new theory for their behavior.
http://www.universetoday.com/2009/12/07/red-giant-brightness-variations-still-mysterious/
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Speculative but plausible nevertheless. 8-)
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How old is our sun then?
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Same age as the Earth Simon. 4.5 billion years.
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You mean we don't have an actual date where we could all sing to it? ;D
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It's pathetic, Rik. The money we spend in these astronomers, and they can't even tell us something as basic as that! ;D
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I know, they're as bad as the NHS IT system.
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It's pathetic, Rik. The money we spend in these astronomers, and they can't even tell us something as basic as that! ;D
yeah but Clive didn't tell you the error bars either...
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I know, they're as bad as the NHS IT system.
baring that in mind, its 6000 years old. Now I feel as informed as the NHS.
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:pmsl: