Answer 1:
Say you headed toward a typical black hole feet
first. The gravitational field near a black hole
is very strong, and it gets stronger as you get
closer to it. This means that the black hole
would pull on your feet more than it would pull
on your head. In fact, the difference between
the force of gravity on your feet and the force
of gravity on your head is so big that you would
literally be torn apart. You wouldn't survive
going into a black hole.
But let's assume
you can build some sort of spaceship that will
protect you as you head toward a black hole.
What will happen? It depends on the type of the
black hole. First, however, I should mention
that all black holes do have something in
common: they all have a closed surface called
an event horizon. Once something, even light, is
inside the event horizon, it can never get
out.
The simplest kind of black hole is
called a Schwarzchild black hole. This type of
black hole doesn't rotate or have an electrical
charge. With this type of black hole, once you
pass the event horizon, you will be unable to
avoid the singularity, where everything gets
crushed down to a point.
If the black
hole has a charge or rotates, you may be able to
avoid hitting a singularity, and Einstein's
equations admit solutions that could be
interpreted as suggesting the possibility of
traveling to a "different universe." These are
just mathematical solutions however. We don't
know if these solutions really describe
reality.
Why wouldn't it make sense to
send someone into a black hole to find out
what's there?
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