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One for the resident Astronomy Buffs...

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HarryAlffa
889718.  Mon Feb 27, 2012 8:08 pm Reply with quote

The Sun becomes a Red Giant, then "puffs" out its outer layers to become a Planetary Nebula with a White Dwarf at the centre. If I remember rightly the white dwarf is made of carbon and oxygen, this is inert and slowly cools from white hot to become a Black Dwarf. The Universe is not old enough for any Black Dwarf to have formed.

 
HarryAlffa
889720.  Mon Feb 27, 2012 8:11 pm Reply with quote

Dark matter is "weakly interacting", except to gravity - which is why it was postulated to explain the orbital speed of the outer stars in Galaxies.

 

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