So as Bruce said ,A less catastrophic, plausible outcome could also involve the inflation of the Sun into a short Red Giant phase, possibly with planetary neubula discharge before the Sun settles back onto the main sequence. Hay y'all, this could even have a bright side: If a reduced massed Sun survives it might stay on the MS for a few more billions of years! The Sun will have had a life extending makeover.
Doum: Gee i have problem with the use of quote. Sorry:
-It might be what will happen. Unless the sun go pouf!!! Rob, i am not sure that a life habitat near neptune will be safe now. It might be better to go to another star as you said. But a 4000 km/s black hole initial speed being at a 1000 UA (150E12 meters) from the sun will take 434 days to travel. Not counting the acceleration the 2 bodies get from their mutual gravity. So it will take less days then that. It aint enough to escape the drama. Even at an initial speed of a 1000km/s, it still will take about 4.75 years for the black hole to get to the sun. Still not enough. At a 100 km/s it will take 47.5 years for the 2 bodies to meet. That might be enough to build a spaceship and get the hell out. But it still seem short in time.
im not sure my calcul is right. But checking and rechecking i still get those number.
PS: 4000 km/s= 4 000 000 m/s initial speed
1000 AU= 150E12 meters
i got the answer in seconds. so /60/60/24 and if needed /365
Now im wondering, is it possible for a black hole to only have an initial speed of only a 100 km/s when it is at a 1000 AU from the sun? Is it a common speed?
Bruce, black hole do evaporate
i am ok now. i think !!?