At the beginning of the merging galaxies, the brightness of our sun will increase by 67%. This will lead to the fact that our planet will turn from a blossoming oasis into a huge greenhouse, as Venus. All life on the planet's surface will die even when brightness increase by 20%, organisms in the oceans can hold out a little long. So, after 4 billion years the Earth will be lifeless.

It is quite possible that we will see for this merger from the new home, somewhere on the edge of the universe, if humanity will go on the right path of development.