Does milky way has a couple of more billion years to survive?

Updated: Aug 6, 2020



Want to know the fate of our galaxy? You have come to the right Place.


Now if anyone has read his or her 9th grade physics text book, he or she would know that gravity is the “force of attraction that attracts a body, towards any other physical body having mass.”

Similarly, fueled by the power of gravity , the two galaxies are hurtling towards each other, 402,000 kilometers per hour. But even at that speed, they won't meet for another four billion years. And when they would meet, The galaxies will pass through each other, get snapped back together by gravity, and eventually merge cores. Now, even the Andromeda galaxy could be visible to the naked eye although only in a dark place without any air or light pollution.


Could this really happen ?


Could our milky way be destroyed by another galaxy in a couple more billion years?


Yes, until 2012, it was not known whether the collision was definitely going to happen or not. In 2012, researchers concluded that the collision is sure by using a device to track the motion of stars in Andromeda between 2002 and 2010 with sub-pixel accuracy. Andromeda's sideways velocity with respect to the Milky Way was found to be much smaller than the speed of approach and therefore it is expected that it will directly collide with the Milky Way in around four and a half billion years

The Andromeda Galaxy is approaching the Milky Way at about 110 kilometres per second (68 mi/s) as indicated by blueshift. However, the lateral speed is very difficult to measure with a precision to draw reasonable conclusions

Andromeda, is believed to have collided with at least one other galaxy in the past, and several dwarf galaxy such as Sgr dsph are currently colliding with the Milky Way and being merged into it. Therefore, collisio between galaxies are relatively common and have happened in the past.


Would the solar system survive ?


As we all know our galaxy would not survive , instead the two galaxies will merge to form a giant elliptical galaxy.

As the Sun continues to 'burn' hydrogen into helium in its core, the core slowly collapses and heats up, causing the outer layers of the Sun to grow larger. ... It is a very gradual process, and in the last 4 billion years, the Sun has grown by perhaps 20 percent.

At that point, the sun will not yet be a red giant star – but it will have grown bright enough to roast the earth's surface. Any life forms still there, though, will be treated to some pretty spectacular cosmic choreography.


And in fact the solar system could survive this collision and outlive our galaxy .


Based on current calculations the scientists predicted a 50% chance that in a merged galaxy, the Solar System will survive, but will be swept out three times farther from the galactic core than its current distance. They also predict a 12% chance that the Solar System will be ejected from the new galaxy sometime during the collision. 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.


After a billion of years the sun could have enough energy to drive out human life from earth, or roast the surface of mars .


Would the human life survive ?


Luckily, experts think that Earth will survive, but it won’t be entirely affected by the collision, and the collision would be unfolded right within our eyes, changing the night sky to look like nothing any human has seen.

But would the human life survive the clash ?

Assuming that human beings, or life, still exists on Earth at that time, they will have survived so much due to the ongoing death of the sun, that the gravitational pertubations due to the galactic collision will be nothing.

As mentioned earlier, keeping 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.

Any life that has survived those events and still lives on Earth will surely take a galactic collision in stride.

I 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.

If the humans are planning to survive till the clash, interstellar voyages should be kept in mind as it’s the only chance to escape this planet because in a next billion of years earth will be no longer habitable AND 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.



Hope you guys enjoyed the read , meet you guys next week with another inquisitive topic . Till then, bye !

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