Earth's Movement and Atmosphere with a Black Hole Sun

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In summary, when imagining the sun being replaced by a black-hole of the same mass, the gravitational effects on Earth would remain the same, but the sun's thermal energy would no longer be present, causing the Earth to quickly freeze. The Earth would continue its regular movement around the sun, as gravity depends only on mass and not on the type of object. Black holes do not have a stronger gravitational pull than other objects of the same mass, but their unique ability to allow objects to get closer to them makes their gravitational pull stronger. In the case of a supernova-created black hole, it would be less massive than the original star due to the explosion. However, our sun is not massive enough for this to occur.
  • #1
havaliza
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please help me to answer to this problem:

Problem: Imagine that we replace sun with a black-hole of same mass.
1. How would be movement of earth?
2. Does the atmosphere of Earth change? If yes, explain.​

thnx
 
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  • #2
What are the relevant equations here?
 
  • #3
From a standpoint of the gravitational effects, nothing on Earth would change. From the standpoint of the sun's thermal energy, the Earth would quickly freeze.
 
  • #4
You mean that Earth will continue it's regular movement around the earth?
I was thinking that Earth would straightly go into the black-hole, wouldn't it?
Could you explain a little bit more, please.
 
  • #5
havaliza said:
You mean that Earth will continue it's regular movement around the earth?
I was thinking that Earth would straightly go into the black-hole, wouldn't it?
Could you explain a little bit more, please.

Gravity depends on one thing and one thing only: the mass.

Since you've replaced the sun with an equivalent mass - regardless of what that mass is - the gravitational force will not change.

Black holes do not have any more gravitational pull than any other object of an equivalent mass. What's unique about black holes is that you can get much closer to them, which is where gravity gets very strong.
 
  • #6
DaveC426913 said:
Gravity depends on one thing and one thing only: the mass.

Since you've replaced the sun with an equivalent mass - regardless of what that mass is - the gravitational force will not change.

Black holes do not have any more gravitational pull than any other object of an equivalent mass. What's unique about black holes is that you can get much closer to them, which is where gravity gets very strong.

Wow! Thank you!
I got it.
 
  • #7
Also, a 'normal' black hole created during a supernova event is much less massive than the original star. A huge part of the star is blown off as part of the explosion. Our sun is not massive enough for that to occur, though.
 

1. What would happen if the sun were replaced with a black hole?

Replacing the sun with a black hole would have catastrophic consequences for our solar system. The immense gravitational pull of the black hole would disrupt the orbits of all the planets, causing them to either be pulled into the black hole or flung out of the solar system. This would also have a major impact on Earth's climate and could potentially lead to its destruction.

2. Would the Earth still receive heat and light from the black hole?

No, a black hole does not emit any heat or light. In fact, it absorbs all the surrounding light and matter, making it impossible for Earth to receive any energy from it. This would result in a permanent state of darkness and extreme cold on Earth.

3. How would the disappearance of the sun affect other stars in the universe?

The disappearance of the sun would not have a direct impact on other stars in the universe. However, it would alter the gravitational balance in the solar system, which could potentially affect the orbits and stability of nearby stars. Additionally, the sudden loss of a star as large as the sun would be noticeable to other stars in our galaxy.

4. Can a black hole be replaced with another star?

Technically, it is possible to replace a black hole with another star. However, this would require an immense amount of energy and precise positioning to counteract the black hole's gravitational pull. It is not a feasible or realistic option at this time.

5. How would the Earth's rotation be affected by a black hole?

If the sun were suddenly replaced with a black hole, the Earth's rotation would be significantly disrupted. The black hole's powerful gravitational pull would slow down or even stop the Earth's rotation, leading to major changes in weather patterns and potentially causing catastrophic events such as earthquakes and tsunamis.

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