Secret Of The Cosmos – Black Holes Mysteries Of The Universe – Space Discovery Documentary

Secret Of The Cosmos - Black Holes Mysteries Of The Universe - Space Discovery Documentary Listen

A livestream from How the Universe Works published in Space

he first rule for anyone dealing with a black hole is, of course, don’t get too close. But say you do. Then you’re in for quite a trip — a one-way trip — because there is no coming back once you fall into a black hole.

A black hole isn't actually a hole. If anything, it's the opposite. A black hole is a place in space containing a lot of stuff packed very closely together. It has accumulated so much mass — and therefore gravity — that nothing can escape it, not even light.

And if light cannot escape a black hole, then neither can you.
As you approach a black hole, its gravitational pull gets stronger. That's true of anything with gravity, including the Earth and sun.

Before long, you pass a point called the event horizon. Every black hole has one. That's true whether the black hole has the mass of a single star or as much as the collective mass of millions (and sometimes billions) of stars. An event horizon surrounds each black hole like an imaginary sphere. It acts like a boundary of no return.

What happens next isn’t pretty — but if you go in feet-first, you might be able to watch. Since your feet are closer to the black hole's center, its gravity pulls stronger on your lower body than on your upper body.

Look down: You will see your feet being drawn away from the rest of your body. As a result, your body gets stretched, like chewing gum. Astronomers refer to this as “spaghettification.” Eventually, your whole body gets stretched into one long human noodle. Then things really start to get interesting.

For instance, at the center of the black hole, everything — including your shredded self — collapses to a single point.

Congratulations: Once there, you really have arrived! You also are on your own. Scientists have no idea what to expect once you get there.

Luckily, you don’t have to fall into a black hole to learn about this cosmic phenomenon. Decades of study from a safe distance have taught scientists quite a lot. Those observations, including startling discoveries made in recent months, continue to add to our understanding of how black holes help shape the universe.
#Universe #Space #Documentary