Name: 人工惑星を作ったら？ (What If We Built an Artificial Planet?)
Uploaded: 2021-01-14T10:39:49.000Z
Duration: 4 min 11 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

What if, someday, we decided that the usefulness of our planet had run its course,

and humans needed to scour space to find somewhere new to live?

But instead of finding a potentially habitable Earth-like exoplanet light years away,

Rocky planets like Earth are born from the leftover material

They start off as grains of dust smaller than the width of a human hair.

These grains fuse into larger chunks that keep colliding with each other

they develop into a new terrestrial world.

Theoretically, we understand how planets are formed in the Universe.

But how would we go about manufacturing an artificial one?

If we humans were to build a planetary replica and populate it,

we'd have to churn out a rock with an atmosphere of breathable air,

We'd start the construction in the Sun's habitable zone.

That would help us maintain Earth-like temperatures on our artificial planet.

But where would we find all the materials to build it?

The problem is, the Earth has the mass of over 2,000 asteroid belts.

There's simply not enough asteroids in the Solar System

But there could be enough materials in the Oort cloud -

the swarm of icy debris that, hypothetically,

exists in the outermost reaches of the Solar System.

But this cloud is so far away, that even Voyager 1,

that's been traveling at 17 km/s (11 mps) for the past 41 years,

And it won't make it to the other side of the Oort cloud

We'd need to build some faster spacecraft

to get all that dust and nudge it in the right direction.

We could also start stealing moons from other planets.

would give us enough material to craft a planet about 7% the size of Earth.

if we could manage to pull them out of Jupiter's orbit.

It wouldn't be necessary to build our new world as big as the Earth

to replicate the same force of gravity we feel now.

If we could pack one tenth of the Earth's mass

Still, it would take us at least several hundred years to finish the construction.

Once all the engineering issues were solved,

and our newly formed artificial planet settled into orbit around the Sun,

We'd let it evaporate to create the atmosphere.

We could even inject some of the carbon dioxide

released by polluting industries on Earth.

Plants would slowly build up oxygen in the atmosphere

Finally, after millennia of planet-building,

on the new terrestrial human-made planet.

the Earth's replica wouldn't seem much different from the original.

Earth-like temperatures and gravity would make it feel like our home planet.

But it wouldn't be as stable as the Earth.

Our artificial world would require active maintenance -

Currently, there's so much we don't know about the Universe.

And we can only guess how a new planet would form within it.

At this point, it may be easier to terraform an existing world

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人工惑星を作ったら？ (What If We Built an Artificial Planet?)

material

trick

potentially

force