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Frank.
As I understand it, Alpha Centauri A and B orbital period is about 80 years. So they are quite well seperated. I am not aware of any figures on when they may merge but I would be thinking it would be billions of years at the soonest. Given that both stars are similar in size to the sun they will be white dwarfs long before that. When they do merge it will create a nice Type 1a supernova I would imagine. Of course the may not be anywhere near the sun when taht happens!
Malcolm
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