To the End of Time and Back

The Theory of Black Holes

To+the+End+of+Time+and+Back
Spacetime with planets

Albert Einstein, the man who developed the theory of relativity, has answered questions that other scientists thought were impossible to answer. Einstein knew many things, but what he didn’t know was that something very strange was within his equations; the recipe for an object that could posses infinite gravity, that could even stop time itself. He refused they could exist in reality. But reality is stranger than fiction. We found these objects, and there are many: black holes.

You might be wondering “How are these so-called black holes formed?” We’ll talk about that first. Black holes are collapsed stars, but not just any stars become black holes. The star needs to be very, very massive to become a black hole. If a star is up to nine times the mass of the Sun. it is not massive enough to become a black hole. Instead, it will become a white dwarf. BUT… if a star is big enough- 25-40+ times the mass of our sun- it will compress upon itself and become a black hole, defying the laws of physics.

Great, now we have a black hole, sucking in everything: light, space dust, stars, moons, planets: you name it. Nothing can escape: even nothing. Black holes suck in nothing, too! 🙂

So, now, finally, we’ll get to the juicy stuff: time travel. Black holes can be used to travel through time.

To understand black holes and time travel, you first have to understand spacetime. Space is formed of 2 things: space, the matter, and time, the… well…time. The 2 run across the universe like a stitched garment, intersecting a lot. This is the spacetime. The gravity of planets and stars and moons will create dents in spacetime. However, black holes will create not dents in spacetime but tears- that’s how huge their gravity is. If you find a tear in spacetime (like a black hole), you can slip through that tear and through a wormhole, a tunnel connecting times and spaces.

A wormhole connecting 2 points in spacetime
Inside a wormhole

Phew. Let’s take a break from the sciency stuff for now. Instead, we’ll talk about what happens after you make it to a black hole. Black holes are split into 3 main parts: the photon sphere (the collection of light particles), the event horizon (point of no return) and singularity (just a little something that can make another Big Bang). If you manage to go just below the horizon, well, congrats! You survived the infinite gravity and made it into another universe! Plus, you get to be on the Earth’s solar system’s universe’s biggest roller coaster: a wormhole. Enjoy the ride (and please don’t be stuck in the year 3487932749732)!

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Flat Spacetime