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This black hole formed when the Universe was only One billion years old.
http://www.cnn.com/2015/02/26/intl_worl … lack-hole/
It is the most massive black hole ever found, the question is, is it still around today? Could we go there in a spaceship? Lets suppose we could accelerate at 1-g indefinitely, probably this black hole was about 12 billion light years away, it is receding from us as the Universe expands, Probably by the time the starship has traveler 12 billion light years, the Universe would be 25 billion years old. Probably the black hole would be further away by the time we traveled that distance, they say the Universe's expansion is accelerating, but is it accelerating at 9.8 meters per second squared away from us at that distance? I suspect the black hole would still be there by the time we got there, but it would no longer be a quasar. I think some version of an interstellar ramjet would be required. Theoretically with Einstein's relativity that black hole could be reached within a human lifetime.
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This black hole formed when the Universe was only One billion years old.
http://www.cnn.com/2015/02/26/intl_worl … lack-hole/
It is the most massive black hole ever found, the question is, is it still around today? Could we go there in a spaceship? Lets suppose we could accelerate at 1-g indefinitely, probably this black hole was about 12 billion light years away, it is receding from us as the Universe expands, Probably by the time the starship has traveler 12 billion light years, the Universe would be 25 billion years old. Probably the black hole would be further away by the time we traveled that distance, they say the Universe's expansion is accelerating, but is it accelerating at 9.8 meters per second squared away from us at that distance? I suspect the black hole would still be there by the time we got there, but it would no longer be a quasar. I think some version of an interstellar ramjet would be required. Theoretically with Einstein's relativity that black hole could be reached within a human lifetime.
Probably now it will be beyond obserbable horizon so it will be out of reach without some kind of FTL drive.
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If it has been observed, it is within the observable horizon.
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If it has been observed, it is within the observable horizon.
It has been oberved at it was 12 billion years ago.
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The observable horizon is not the same as the horizon-of-future-action. Since the expansion of the universe is accelerating, there are things we can observe today which at some point will red-shift to infinity and become unobservable and unreachable. I think it is quite likely that something so distant while within our past is outside of our future light cone.
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But do you really think that black hole is accelerating away from us due to the Universe's expansion at 10 meters per second squared?, that is quite a large Hubble Constant don't you think. I think so long as a space ship is accelerating towards an object faster than the Universe's expansion rate, it will catch up with that object.
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The black hole is not accelerating away. The space in between us and it is expanding.
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The black hole is not accelerating away. The space in between us and it is expanding.
Not that fast, if it accelerated that fast it would drop beyond the event horizon as it red shifted down to invisibility in less that 100 years!
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