Name: 由光組成的黑洞能否為我們的宇宙飛船提供動力？ (Could Black Holes Made of Light Power Our Spaceships?)
Uploaded: 2021-01-14T10:44:26.000Z
Duration: 3 min 54 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

There are some crazy ideas for spacecraft propulsion out there, but tops among them

情態助動詞 B1

must be the idea to power an interstellar craft with a black hole.

Yes, that's right, a black hole, which is a region in space where the gravity is so

strong that, all together now: “not even light can escape,” very good, can itself

The black holes you're probably used to are made of matter, and lots of it.

Stellar mass black holes usually form after giant stars go supernova and leave a core

If that core is more than about three times as massive as our entire sun, give or take

half a sun, its own gravity will crush the entire thing down to a single point, forming

However, because of Einstein's equation E=mc2 we know that mass and energy are related.

It's right there; energy equals mass times the speed of light squared.

So you could use energy to bend space into a black hole the same way nature uses mass.

You would just need an insane amount of energy to get the equivalent of enough mass, since

the speed of light is a huge number, nearly 300,000 km/s, and the equation calls for you

Light carries energy, so if you managed to cram enough into a tiny space you would create

what's called a kugelblitz, which is German for “Ball Lightning.”

The good news is if we wanted to make a kugelblitz we wouldn't necessarily have to use the

equivalent of about three solar masses like nature needs for a stellar black hole.

We could make them much smaller, say one with the equivalent mass of two empire state buildings.

Then we would “only” need as much energy as our entire sun puts out in 1/10th of a

We could use a laser to create this low mass kugelblitz, most likely one that shoots gamma

rays instead of visible light, since gamma rays are the most energetic electromagnetic

waves and we're trying to be efficient in our ridiculousness.

If we managed to create this absurdly powerful laser, focused it at some point in space,

and pulled the trigger, we could create a tiny black hole, one with a radius smaller

A black hole this size would decay over the course of about five years, giving off hawking

radiation as it decays, and it might be possible to use that radiation to power a spacecraft.

I know, you've followed me pretty far down the rabbit hole already, but I promise it's

A 2015 paper proposed that if we could create a dyson sphere around our little kugelblitz

and harness the energy to propel a spacecraft, it could accelerate up to 72% the speed of

light before the black hole sputters out.

That is of course assuming the dyson sphere isn't melted by the hawking radiation.

Or that the extreme heat generated from packing an insane amount of energy into a tiny space

doesn't cause something unpredictable to happen.

A kugelblitz would be so hot that the math we use the predict the laws of physics doesn't

apply, so we can't accurately say how it would behave.

So black holes made from light and spacecraft that could harness them are still purely based

Hypothetically they could exist, but I wouldn't pin your dreams of interstellar travel on

Though, you can pin your dreams on a new cell provider.

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Just 40 bucks a month for unlimited messages, minutes, and data at speeds up to 5 megabits

When you think the future of phone service, think Visible.

$40/mo phone service that's actually $40/mo.

Unlimited everything (including data at speeds up to 5 Mbps).

For more on Dyson Spheres, check out this episode of Space Crafts!

There is another phenomenon called ball lightning, which is totally unrelated to a kugelblitz.

I bet that's only confusing if you're german.

Thanks for watching, and I'll see you next time on Seeker.

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由光組成的黑洞能否為我們的宇宙飛船提供動力？ (Could Black Holes Made of Light Power Our Spaceships?)

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