Name: Astrophysicist Explains Gravity in 5 Levels of Difficulty | WIRED
Uploaded: 2021-05-13T00:32:53.000Z
Duration: 36 min 32 s
Description: 我操你媽啊学べる英語：

- Hi, I'm Janna Levin, I'm an astrophysicist,

Gravity seems so familiar and so everyday,

and yet it's this incredibly esoteric abstract subject

that has shaped the way we view the universe

has given us the strangest phenomena in the universe

that has changed the way we look at the entirety of physics.

It's really been a revolution because of gravity.

we would be floating if there was no gravity,

we're sitting right down on these chairs.

So gravity wants to attract us to the Earth,

that even though we're actually pulling the Earth

a little bit to us, you don't notice it so much.

You know, the Moon pulls on the Earth a little bit.

- [Janna] Exactly, the Moon is such a big body

But more than the Moon, think about the Sun

All of those things are acting on you and me right now.

- If gravity was too strong, would we be able to get up?

if you look at the astronauts on the Moon.

On the Earth, it's harder, 'cause it's bigger.

- People think that while you're sleeping,

and gravity isn't crunching you together,

but when you're standing or walking or sitting,

the gravity contracts your spine ever so slightly,

so that in the morning you might be a little bit taller

and the other who went to the International Space Station.

He was there for a long time, and when he came back,

he was actually taller than his twin brother.

After a while here on Earth though he'll readjust,

Have you ever heard of how gravity was discovered?

and the apple fell from the tree and hit him on the head

and he had an epiphany and understood this law,

this mathematical law for how that works.

I don't actually think that's a true story, though.

So Isaac Newton realized that even if you're heavier,

you will fall at the same rate as something much lighter,

Once you hit the ground, if you're heavier,

you'll hit the ground with much greater force,

but you will hit the ground at the same time.

- So, if we both dropped down from a plane,

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Astrophysicist Explains Gravity in 5 Levels of Difficulty | WIRED

absolutely

illusion

matter

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