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Philosophaie
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What happens first Sun Red Giant or Andromeda collision?
https://en.wikipedia.org/wiki/Andromeda–Milky_Way_collision
Fate of the Solar System[edit]
See also: Formation and evolution of the Solar System § Galactic collision and planetary disruption
Two scientists with the Harvard–Smithsonian Center for Astrophysics stated that when, and even whether, the two galaxies collide will depend on Andromeda's transverse velocity.[3] Based on current calculations they predict a 50% chance that in a merged galaxy, the Solar System will be swept out three times farther from the galactic core than its current distance.[3] They also predict a 12% chance that the Solar System will be ejected from the new galaxy sometime during the collision.[15][16] Such an event would have no adverse effect on the system and the chances of any sort of disturbance to the Sun or planets themselves may be remote.[15][16]
Excluding planetary engineering, by the time the two galaxies collide, the surface of the Earth will have already become far too hot for liquid water to exist, ending all terrestrial life; that is currently estimated to occur in about 3.75 billion years due to gradually increasing luminosity of the Sun (it will have risen by 35–40% above its current luminosity).[17][18]
I've seen an astronomer on tv last night who said that the oceans will be vaporized in about 1 billion years from now. However, it was a rather informal remark, not an exact calculation.anorlunda said:By chance, there is a section in Wikipedia that directly addresses your question. It seems that the bottom line is "by the time the two galaxies collide, the surface of the Earth will have already become far too hot for liquid water to exist, ending all terrestrial life; that is currently estimated to occur in about 3.75 billion years "
A Sun Red Giant is a stage in the life cycle of a star where it has expanded and become much larger and brighter. This occurs when the star has burned through most of its hydrogen fuel and begins to fuse helium, causing it to expand.
A Sun becomes a Red Giant when it has used up most of its hydrogen fuel and starts to fuse helium. This fusion process causes the star to expand, becoming much larger and brighter. The outer layers of the star become cooler, giving it a reddish appearance.
The Sun is currently in its main sequence phase and is expected to become a Red Giant in about 5 billion years. This is when it will have used up most of its hydrogen fuel and begin to fuse helium, causing it to expand and become a Red Giant.
The Andromeda collision refers to the predicted collision between our Milky Way galaxy and the Andromeda galaxy. It is estimated to occur in about 4.5 billion years and will result in the two galaxies merging to form a larger elliptical galaxy.
The Sun becoming a Red Giant will happen first, in about 5 billion years. The Andromeda collision is estimated to occur in about 4.5 billion years. However, both events are still far off in the future and will not affect us in our lifetimes.