it will take a trillion years for their love to cool off completely.
they've been together for 4.6 billion years. their love is intense. so intense that nuclear reactions take place. they know, however, that everything will end in another five billion years or so. he will fuse helium. she will swell up. they will swallow the earth. their surface temperature will rise. it will fall. they will try to reclaim what they have now. ultimately, though, their love, their intrinsic brightness, will decline into nothingness.