@ninjacolin The Milky Way Galaxy will begin its collision with our nearest neighboring galaxy, Andromeda, in shortly over 2 billion years. It’s ashamed we won’t be around to watch the 5 billion year merger of the two galaxies play out, because it will truly provide a spectacular nighttime sky to watch, as this supercomputer generated video shows. That massive elliptical galaxy that the merger will create will likely generate enough radiation to sterilize Earth.
But it won’t need to do that. In just 1 billion years, assuming we don’t trigger it sooner, our slowly dying sun’s radiation level will have risen high enough to put Earth into runaway global warming much like that currently in effect on our nearest neighbor, Venus. Surface temperatures will be high enough to melt lead, and life as we know it will be gone. If any life remains at that point, it would have to be far underground, or adapted to thrive in temperatures even our hardiest extremophiles can’t handle today. All liquid water will be vaporized.
The sun will expand as it reaches its end of life in 7.59 billion years, with its photosphere finally encompassing earth and melting us into its mass just as it nears the peak of its expansion.
And have a nice weekend, @ninjacolin. 1 billion years is quite some time to learn how to migrate to someplace more hospitable. As it has been said, the meek shall inherit the kingdom of Earth, the wise will move on.