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TED Talks Daily

How radio telescopes show us unseen galaxies | Natasha Hurley-Walker

TED Talks Daily

TED

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4.111.9K Ratings

🗓️ 24 October 2017

⏱️ 16 minutes

🧾️ Download transcript

Summary

Our universe is strange, wonderful and vast, says astronomer Natasha Hurley-Walker. A spaceship can't carry you into its depths (yet) -- but a radio telescope can. In this mesmerizing talk, Hurley-Walker shows how she probes the mysteries of the universe using special technology that reveals light spectrums we can't see.

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Transcript

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0:00.0

This TED Talk features radio astronomer Natasha Hurley Walker, recorded live at TEDx Perth, 2016.

0:18.0

Space, the final frontier.

0:26.1

I first heard these words when I was just six years old,

0:28.1

and I was completely inspired.

0:31.1

I wanted to explore strange new worlds.

0:32.7

I wanted to seek out new life.

0:35.6

I wanted to see everything that the universe had to offer.

0:40.6

And those dreams, those words, they took me on a journey,

0:43.9

a journey of discovery, through school, through university,

0:47.6

to do a PhD, and finally, to become a professional astronomer.

0:53.2

Now, I learned two amazing things, one slightly unfortunate,

0:55.6

when I was doing my PhD,

1:01.5

I learned that the reality was I wouldn't be piloting a starship anytime soon.

1:07.1

But I also learned that the universe is strange, wonderful and vast,

1:10.9

actually too vast to be explored by spaceship. And so I turned my attention to astronomy to using telescopes.

1:14.9

Now, I show you before you an image of the night sky.

1:17.8

You might see it anywhere in the world.

1:20.1

And all of these stars are part of our local galaxy, the Milky Way.

1:24.7

Now, if you were to go to a darker part of the sky,

1:29.2

a nice dark site, perhaps in the desert, you might see the center of our Milky Way galaxy spread out before you, hundreds and billions

1:34.3

of stars. And it's a very beautiful image, it's colorful, and again, this is just a local corner

1:41.0

of our universe. And you can see there's a sort of strange dark dust across it.

...

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