What would happen if the sun suddenly became a black hole without changing its mass? This has been the most often requested question we’ve received this Autumn.
And you are not alone if you are already seeing the Earth spiraling into the black-hole-Sun, becoming spaghettified, and other such horrors!
Of fact, owing to a lack of solar energy, planet Earth would become utterly devoid of life in a short period of time (photosynthesis would halt, and the earth would essentially become a snowball).
On the perpetually black sky, you will no longer be able to see the Moon or our neighboring planets, just stars. But there’s good news: our black-hole-Sun will be so little that we won’t sense any change in terms of gravity. Even if the Sun were to change into a black hole without the usual expansion, explosion, and mass loss, a solar mass black hole would still be small!
Singularity is a point of infinite density when mass is compressed into a black hole. The wider the event horizon (the point of no return) of a huge object, the farther away a stable orbit of a planet would be from a black hole. The size of the event horizon is dictated by the Schwarzschild radius in the simplest case of a non-rotating black hole.
The Schwarzschild radius of a tiny solar mass black hole is around 3 kilometers. As a result, any planet circling more than 3 kilometers from the Solar System’s center would be secure! Of course, you might argue that the Sun spins, and therefore the black hole will as well. And you’ll be completely correct! However, the event horizon will be significantly narrower in such situation.
The blackhole may not be able to absorb mercury. But! It doesn’t give out any stardust. Furthermore, the blackhole may begin to absorb cosmic dust, gradually expanding its mass. It may not account for much, but given enough time, it might very well be the end of the solar system.
In this case, the Sun is replaced by a Blackhole of equal mass. Blackhole, on the other hand, is a vacuum cleaner, and the more it sucks in, the farther it can reach.
Among other things, it has an impact on the escape velocity. As a result, if the Sun collapses into a black hole, the Earth’s orbit will remain unchanged. The Sun, on the other hand, will not provide us with any light or heat since nothing can escape a black hole.
The Earth’s orbit around the Sun would remain unaltered if our Sun was abruptly replaced by a black hole of the same mass. Of course, the Earth’s temperature would fluctuate, and we wouldn’t be affected by solar wind or solar magnetic storms. Crossing within the Schwarzschild radius is required to get “sucked” into a black hole.
When our sun dies, it isn’t big enough to cause a stellar explosion known as a supernova, and it will never become a black hole.
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