If you fall into a black hole, where do you
go? You know black holes they're this big
black hole in space and a worm hole is different
because it goes to a new, you know, a new
world, but those don't exist and black holes
do.
Bo, I think that's your name. We couldn't
quite make it out but Bo, greetings. Bill
here. You're asking about black holes. That's
a great question. The way I like to describe
a black hole, it's a star. A black hole is
a star. Now, when you and I think of stars
we think about the sun, which is giving off
all this light. But the other thing about
the sun to keep in mind is it has a lot of
gravity because it's huge. And everything
that has mass, everything that would weigh
something here on earth has gravity. And the
exact origin of gravity, where it actually
comes from is not fully understood Bo. If
you could figure that out you might change
the world. But with that said, a black hole
is a star so big, how big is it? It's so big
that even light cannot escape it because it
has so much gravity.
One of Einstein's discoveries, Albert Einstein's
discoveries was that gravity changes the path
of light. It can bend light. It's just not
in our everyday experience. Where we're in
a room like this or where you are there's
not nearly enough gravity to bend light enough
to measure, especially with just human eyes.
To measure it we usually find objects way
out in space of known brightness and we
see where we think there going to be and then
where they really appear to be and then we
infer or figure out that they're not where
we thought they were going to be because gravity
bent the beam of light. It's amazing. Anyway,
so a black hole is a star so massive that
not even light can escape from it.
Now, when you get something that big the gravity
as you get near it changes and you know this.
Like if you're real far away from the light,
a light bulb, it's dim. When you walk up really
close to it it gets brighter and brighter
and brighter. Well, the same is true of the
gravity that a star produces or anything with
mass produces. The closer you are to it the
more gravity it has. Satellites in space have
less gravity to fight than you and I do here
on the surface once they get out there in
space, for example. So when you fall into
a black hole, Bo, first of all you don't want
to do that because the difference in gravity
between your feet and your head, just that
far is so powerful it would stretch you into
really, really thin, like as then as a piece
of spaghetti as the saying goes. And Bo, I
don't want to shock you that that would be
really bad, but in science fiction we love
that because we can fly around in spaceships
and they have sort of science fiction magic
powers and we can survive stuff like that
in stories.
Now you mention wormholes, wormholes are an
idea that people think may exist. And the
idea is that you would fall into something
with a lot of gravity like a black hole and
instead of just getting crushed and killed,
you would end up in another part of the universe
at a different time. And this is something
that physicist say to each other at physics
meetings and they're oh yeah, oh yeah different
part of the universe different time. Yeah.
That's great. Piece of cake. Black hole, worm
hole, sure. Sure. But understand Bo, nobody
has ever done this. These are theoretical
things. They're important theoretical things
because they are consistent or they're part
of the bigger story that astronomers and astrophysicists
and just scientists in general, they're part
of the bigger story of the universe and where
you and I came from and what we're all doing
here and why the earth goes around the sun
and why the other planets go around the sun
and they're all in the same plane almost,
except Pluto, which is going – and so it's
all part of this big story.
So these are great questions Bo but they really
don't have clear succinct answers right now,
but perhaps you will be the scientist, the
astrophysicist who figures this out for sure.
When you have these objects or these theoretical
places in space that seem to have so much
energy, you just got to wonder if we could
harness that energy and do something fantastic
with it. Keep asking questions Bo. This is
great. Carry on.
