Name: ポケットにブラックホールがあったらどうする？ (What if there was a black hole in your pocket?)
Uploaded: 2021-01-14T05:40:37.000Z
Duration: 3 min 38 s

What would happen to you if a black hole the size of a coin

もしブラックホールが突然現れたら

様態の副詞

だが死に方はブラックホール次第だ

Is it a black hole with the mass of a coin,

Suppose a US nickel with the mass of about 5 grams

原子は10の－11乗メートルだから

This black hole would have a radius of about 10 to the power of −30 meters.

By comparison, a hydrogen atom is about 10 to the power of −11 meters.

So the black hole compared to an atom is as small as

10の－23乗秒で質量は消えてしまう

And a small black hole would also have an unimaginably short lifetime

It would radiate away what little mass it has in 10 to the power of −23 seconds.

Its 5 grams of mass will be converted to 450 terajoules of energy,

which will lead to an explosion roughly 3 times bigger than

the atomic bombs dropped on Hiroshima and Nagasaki combined.

その質量は地球よりも大きくなる

If the black hole had the diameter of a common coin,

then it would be considerably more massive.

In fact, a black hole with the diameter of a nickel

would be slightly more massive than the Earth.

It would have a surface gravity a billion billion times greater

Its tidal forces on you would be so strong

これは経験したことのない重力だ

that they’d rip your individual cells apart.

重力は 宇宙全体にまで及ぶ力であり

The black hole would consume you before you even realized what’s happening.

Although the laws of gravity are still the same,

the phenomenon of gravity that you’d experience would be very different

だがブラックホールに立った場合

The range of the gravitational attraction

extends over the entire observable universe,

with gravity getting weaker the farther away you are from something.

足から粉々に砕かれていくだろう

On Earth right now, your head and your toes are approximately the same distance

But if you stood on a nickel-sized black hole,

your feet would be hundreds of times closer to the center,

ブラックホールは中心に落ちて

and the gravitational force would be tens of thousands of times as large

as the force on your head and rip you into a billion pieces.

But the black hole wouldn’t stop with just you.

The black hole is now a dominant gravitational piece

通過したところを飲み込んでいく

of the Earth–Moon–Black-Hole-of-Death system.

You might think that the black hole would sink towards the center of the planet

熱い溶岩の塵が円盤状に残される

ブラックホールは質量が倍になり

In fact, the Earth also moves up onto the black hole and begins to bob around,

all while having swathes of mass eaten with each pass,

ブラックホールが小惑星を引っ張り

As the Earth is eaten up from the inside,

大量の岩を太陽系になだれ込ませる

it collapses into a scattered disk of hot rock,

以後数百万年は 爆発と衝撃だらけだ

surrounding the black hole in a tight orbit.

惑星も力を受けるが軌道は変わらず

The black hole slowly doubles its mass by the time it’s done feeding.

ブラックホールも地球に代わり

The Moon’s orbit is now highly elliptical.

The effects on the Solar system are awesome—

in the Biblical sense of awesome, which means terrifying.

Tidal forces from the black hole would probably disrupt the near-Earth asteroids,

sending rocks careening through the Solar system.

Bombardment and impacts may become commonplace

The planets are slightly perturbed, but stay approximately in the same orbit.

The black hole we used to call Earth will now

continue on orbiting the Sun in the Earth’s place.

This bonus video was made possible by your contributions on Patreon.

The topic is based on a question on the AskScience subreddit

and the glorious answer by Matt [Caplin?], who also worked with us on this video.

Check out his blog, Quarks and Coffee, for more awesome stuff like this!

If you want to discuss the video, we have our own subreddit now.

To learn more about black holes or equally interesting neutron stars, click here.

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ポケットにブラックホールがあったらどうする？ (What if there was a black hole in your pocket?)

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