If a civilization of astronomers in a distant galaxy observed the collision of t

Question

If a civilization of astronomers in a distant galaxy observed the collision of the Milky Way and the Andromeda galaxy, how would you expect these alien astronomers to describe the change in light they would see just before the merger, a few million years after the merger, and a few billion years after the galactic merger. Explain your reasoning in terms of the stars that make up the galaxies. Pay special attention to the overall color of the light from the galaxy, as well as its total luminosity.

Explanation / Answer

SOLUTION:-

Andromeda has numerous satellite galaxies, including 14 dwarf galaxies that it regularly bullies. Whereas most of the rest of the universe is accelerating away from our galaxy, Andromeda is blue-shifted, meaning it’s moving towards us. Both the Milky Way and Andromeda are moving towards each other at a rate of 120 kilometres a second, putting them on course for a galactic smash- up in around 4 billion years. Assuming that human beings, or life, still exists on Earth at that time, that the gravitational pertubations due to the galactic collision will be nothing.Keep in mind that in about 1-2 billion years, the sun will be so hot and large that all the water will have boiled off the earth into space. About 3 billion years from now, the surface of the Earth will be so hot that metals will be melting. though the Milky Way is probably the most massive in the galactic Local Group, Andromeda is the biggest by volume.

Our neighbouring galaxy also contains around twice the number of stars as our own galaxy Any life that has survived those events and still lives on Earth will surely take a galactic collision in stride. imagine, though, that most humans will have fled Earth - if not for distant star systems, then at least for planets in our own system that are going to be warming up enough for human habitation. s soon as possible. When interstellar voyage becomes possible, we should start sending out ships to colonize other planets and star systems. This will likely take a long time, but if we are to survive more than a billion years, it is necessary. Keep in mind that the Sun and Andromeda are events we can predict. We don't know, and can't predict, the next cataclysmic asteroid strike, which is likely to happen in a shorter time than a billion years. There are lots of reasons to exit the planet, we should be worried about the ones we can't predict or see, not the ones we can predict.

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