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originally posted by: TEOTWAWKIAIFF
There is a black hole at the center of the Milky Way. If a star goes in and the x-ray center is aimed directly at us… that is really scary!
3.5 light years away from a supernova or this phenomenon is NOT a safe distance. With an ordinary supernova, even a distance of 130 light years there could be noticeable climactic changes on Earth, but with one this powerful (way more powerful than an ordinary supernova), I think anything less than a distance of 100 light years could have a good chance of causing serious problems, though that also depends on whether there are "jets" of particles or radiation emitted and in what direction. There was some discussion about those earlier in the thread, and they can be so powerful they have been known to wreak havoc on even other galaxies 20,000 light years distant so even 20,000 light years away might not be a safe distance from those types of jets.
originally posted by: MalacodaX
Like someone said previously, glad we're a safe distance away, like 3.5 light years away sort a safe.
So no, 3.5 light years would not be a safe distance from a supernova, as it would destroy the entire ozone layer.
It is estimated that a Type II supernova closer than eight parsecs (26 light-years) would destroy more than half of the Earth's ozone layer.
The flash had, in fact, come from the middle of that distant galaxy, and further analysis suggested that the observations fit what is known about stars being caught in a black hole's gravitational tide.
The reason such an event, producing such a bright flash, is so rare is that two conditions must be met for it to occur: The star must stray close enough to the black hole to cross its "event horizon" -- the point at which it cannot escape the pull of the giant mass -- but the light produced in its destruction must somehow escape the black hole's all-consuming gravity. And for these conditions to occur, the galaxy's central black hole, which is immense even by black-hole standards, must be rotating at a relativistic speed -- close to the speed of light.
Observing the light over several months, the team came to the conclusion that the best explanation for the unusual flash of light was, indeed, the destruction of a star caught in the gravitational tides of an exceptionally massive black hole rotating extremely rapidly.