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B1 Intermediário Inglês 5:29 Educational

Light seconds, light years, light centuries: How to measure extreme distances - Yuan-Sen Ting

TED-Ed · 3,618,347 visualizações · Adicionado há 3 semanas

Estatísticas de aprendizado

B1

Nível CEFR

5/10

Dificuldade

Legendas (92 segmentos)

00:06

Light is the fastest thing we know.

00:10

It's so fast that we measure enormous distances

00:12

by how long it takes for light to travel them.

00:15

In one year, light travels about 6 trillion miles,

00:19

a distance we call one light year.

00:22

To give you an idea of just how far this is,

00:25

the Moon, which took the Apollo astronauts four days to reach,

00:28

is only one light-second from Earth.

00:31

Meanwhile, the nearest star beyond our own Sun is Proxima Centauri,

00:36

4.24 light years away.

00:39

Our Milky Way is on the order of 100,000 light years across.

00:43

The nearest galaxy to our own, Andromeda,

00:46

is about 2.5 million light years away

00:49

Space is mind-blowingly vast.

00:52

But wait, how do we know how far away stars and galaxies are?

00:56

After all, when we look at the sky, we have a flat, two-dimensional view.

01:00

If you point you finger to one star, you can't tell how far the star is,

01:05

so how do astrophysicists figure that out?

01:08

For objects that are very close by,

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