Name: なぜ金星は最悪なのか (Why Venus Is THE WORST)
Uploaded: 2021-01-14T10:30:48.000Z
Duration: 6 min 4 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：

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Venus is sometimes referred to as Earth's sister planet.

It's close by, and pretty similar in size.

It's thought to have been fairly Earth-like early in its history.

it may even have had lots of nice, shallow seas

to undergo massive, rapid climate change,

boiling off the seas and transforming it from what may have been a pleasant, beachy planet

into a desolate nightmare complete with sulfuric acid rain.

Earth's got a bit of a greenhouse effect problem too.

So it seems like studying Venus could help us understand both our past and our future.

sending missions there just isn't worth it.

So, we know Venus is hellish, but how bad is it, really?

Well, the average surface temperature is 471°C.

Mercury is closer to the Sun, but it tops out in the neighborhood of 430°C.

Venus is hotter thanks to its atmosphere.

That atmosphere is made mostly of carbon dioxide,

And the clouds are made of sulfuric acid.

that the surface pressure is a whole 90 times greater than Earth's.

Which would feel like being almost a kilometer beneath the ocean,

if that was something human beings could experience

We could try to engineer something akin to a deep-sea submersible

to keep astronauts alive under the pressure of Venus' atmosphere,

but that would still fall somewhere between very risky and /certain death/.

Astronauts are brave, and they're also very smart.

Smart enough that there's not a lot of motivation for a human mission to Venus.

in which a whole bunch of probes were sent to Venus

But the absolute toughest of the landers, Venera 13,

That was longer than its predicted lifespan of half an hour,

but still shorter than the shortest Harry Potter film.

it was really impressive that humans were able to build something

that could survive the conditions on Venus for longer than 30 minutes.

And that's because machines have their limits too.

If we think of a rover or lander as a set of instruments

we don't just need the packaging to survive,

It's kind of like building a spacecraft for humans,

actually: the outside needs to be strong enough to withstand the environment,

and the inside needs to be hospitable to its inhabitants.

Hypothetically, we could build a lander or rover out of something that is primarily carbon,

we need to create the pressure and temperature conditions necessary

for computers and scientific instruments to function.

And while we've made lots of advances in high temperature computing,

like innovating new heat-resistant materials for circuitry,

we're not ready to put a computer on Venus for a long mission just yet.

Essentially, we'd have to radically rethink and re-engineer everything we know

about space rovers in order to send one to Venus.

And the time, money, and energy it would take to do that is just …

and not really in line with NASA's current goals.

We really want to unravel the origins of life and probe its limits.

before its seas boiled and its air became poison,

evidence of that life would be incredibly difficult to get to,

That evidence would have to have survived billions of years of... Venus,

and if we can't get state-of-the-art technology to last longer than two-thirds of Avengers:

we don't have much chance of finding it in time.

so exploration plans are very much about risk mitigation.

And whatever interesting science might theoretically be on Venus,

it's not worth investing huge amounts of energy on a mission so risky when there are

but it won't immediately break your machines when you get there.

we find new and exciting evidence for a once-habitable red planet,

like dry lake beds and extinct hot springs.

And just past Mars is a field of more great targets: asteroids.