Friday, November 13, 2015

Black Holes by Alexia, Rhett, Alyson

https://www.youtube.com/watch?v=D83VAnnsyDo

23 comments:

  1. Okay you said supermassive black holes could have formed from hundreds of smaller black holes merging together could you go into more detail about that? how close do the smaller black holes have to be one another?

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    1. Black holes can collide to create larger black holes. Once they are close enough their gravitation pulls the other and vise versa. There is no specific distance because it depends on the size of each black hole and their gravitational pull.

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  2. what is the closest black hole to our galaxy?

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    1. there is a supermassive black hole in the center of the milky way galaxy that is about 27,000 light years away

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  3. Do black holes accelerate or are they still?

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    1. The matter that is absorbed by black holes is already accelerating/rotating very fast, however we are not able to exactly tell what the speed is once it enters the black hole. Black holes themselves are not accelerating.

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  4. What is the size range to classify a black hole as an intermediate black hole?

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    1. roughly 100 million to 1 million solar masses.

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  5. do you know the actual incredible density of a black hole?

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    1. Black holes are really hard to get a density. Basically, they are so dense that there is no known mechanism for providing sufficient outward force to counterbalance the inward pull of gravity, so they will collapse into an infinitesimally small size.

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  6. If we can not see a black hole, how do we know they exist?

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    1. Though we cannot see black holes directly, they are so powerful that we can see their unmistakable, dramatic effects on the matter around them.
      There are three main lines of evidence astronomers look for, these include: A blaze of X-Rays, Super- powerful jets of matter, and Rapidly moving stars.

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  7. Do you know how large the most massive black hole documented is?

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    1. the biggest black hole is located inside a galaxy named NGC 1277 and it is about the same mass as 17 billion suns.

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  8. Why can't light pass through black holes?

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    1. One of their basic properties is that they trap light. However, it is also true that nothing exceeds the speed of light. In fact, the theoretical prediction of black holes is due to the General Theory of Relativity, which is built on the principle that the speed of light in a vacuum is constant. The analogy of a cannonball falling back to Earth with the trapping of light in a black hole is only a crude and suggestive one that is not correct at a fundamental level (for one thing, the cannonball has mass, but light does not; it turns out that this difference is critical, because massless particles MUST travel at light velocity, but massive particles CANNOT travel at light velocity).

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    2. One of their basic properties is that they trap light. However, it is also true that nothing exceeds the speed of light. In fact, the theoretical prediction of black holes is due to the General Theory of Relativity, which is built on the principle that the speed of light in a vacuum is constant. The analogy of a cannonball falling back to Earth with the trapping of light in a black hole is only a crude and suggestive one that is not correct at a fundamental level (for one thing, the cannonball has mass, but light does not; it turns out that this difference is critical, because massless particles MUST travel at light velocity, but massive particles CANNOT travel at light velocity).

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  9. Do you know the size of the smallest black hole ever formed?

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  10. Have people ever observed something entering a black hole?

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    1. No. No one has ever seen anything enter a black hole because no one can see a black hole directly. Nothing can escape a black hole, not even light. When you look at a black hole you can see a glow coming from around it with a black center but you cannot see the inside and therefore, you can not see anything that would enter it.

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  11. Have people ever observed something entering a black hole?

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  12. how can we tell the different sizes of black holes if we cannot see them?

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