I'm less sure about the blueshifting which others have commented on. Mathematical explanation: the coordinate transformation (specifically the timelike coordinate) between the two frames blows up at the event horizon. In the frame of the infalling body, it takes a finite amount of time. To an observer remaining far from the event horizon, it takes an infalling body an infinite amount of time to reach the event horizon. Is it not true that a body would never be able to reach the singularity, due to the nature of time changing in relation to light speed? (From the perspective of a distant observer, you would still have to travel infinite proper distance, but your increasing speed grants you the benefit of a diverging time dilation factor, which is how she understand that you will reach the horizon in finite proper time on your clock even as it takes infinite time on hers.) I say this because I think the imagery is vivid yet I've never heard it used in a popular description. You reach it in finite time because as you fall in, you gain momentum, and the fiducial distances are Lorentz-contracted in such way that you cover infinite proper distance in finite proper time.
Something that I didn't really appreciate until recently is, when you start on this journey, the event horizon is an infinite proper distance away. If anything emitting light is falling in ahead of you, you'll see that, at least until you get very near the central singularity. It might deserve mention that it's only totally black, as you say, if you are the only thing falling into the black hole. Seems to me that we still get to see what's going on in (some of) the outside world even when we're inside (until we go squish, of course).Īnd while I assume that you're right that accelerating will reduce my proper time, it would allow me to see more of the outside world (blue-shifted, of course) before I go squish. It's obvious that the null rays still intersect the world line of an infalling observer inside the event horizon. Look at a Penrose conformal diagram of a black hole. Unless I'm missing something, this claim isn't quite right either.
Could a human survive going into a black hole free#
Ĭhanging color into the blue due to gravitational blueshifting.Īre you sure there will be blue shifting even if I'm in free fall as I cross the horizon? If I'm accelerating to remain a fiducial observer, then I'll see blue shift - but if I'm freely falling in, then the only thing I'd notice would be tidal effects (which can be arbitrarily small for a sufficiently large black hole).įrom inside the event horizon, no light from the outside Universe hits your spaceship. Nice account, but I can't help trying to pick some nits.
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