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GEORGE ELLERY HALE
GEORGE ELLERY HALE
USA (1868 - 1938)
George Ellery Hale was an American solar astronomer, born in Chicago. He was educated at MIT, at the Observatory of Harvard College, (1889-90), and at Berlin (1893-94). As an undergraduate at MIT, he invented the spectroheliograph, with which he made his discoveries of the solar vortices and magnetic fields of sun spots.
 

Enjoy these insightful and educational video clips drawn from over 70 hours of interviews with the world's leading figures in astronomy, shot during the filming of 400 Years of the Telescope.

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Richard Hills

Aperture synthesis and resolution
Richard Hills - ESO, Atacama Large Millimeter Array (ALMA)

If you want to get the same resolution as you would get from an optical telescope, you need to have your radio dish hundreds of meters, maybe even kilometers across.

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Richard Hills

Interference and sound waves
Richard Hills - ESO, Atacama Large Millimeter Array (ALMA)

Interference is something we’re quite familiar with these days because we get to use noise-canceling headphones.

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Richard Hills

Interferometry
Richard Hills - ESO, Atacama Large Millimeter Array (ALMA)

This process of combining the signals together from different telescopes is called interferometry.

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Richard Hills

IYA greeting
Richard Hills - ESO, Atacama Large Millimeter Array (ALMA)

So 2009 is going to be the International Year of Astronomy. And that’s, of course, because it’s four hundred years since the invention of the telescope.

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Richard Hills

Newton's theory of light
Richard Hills - ESO, Atacama Large Millimeter Array (ALMA)

Newton’s theory of light was that it was made of little particles, but later development showed that light could be thought of as waves, and the wavelength of the waves that gives rise to the different colors.

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Richard Hills

Introduction to radio telescopes
Richard Hills - ESO, Atacama Large Millimeter Array (ALMA)

Well, here we’ve got radio telescopes, so these are telescopes designed to pick up radio waves coming from distant objects in the universe and they’re reflecting telescopes because the great thing about Newton’s design of the telescope where the reflector gathers all the different colors in the same way and that goes right out to radio wavelengths.

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Richard Hills

Waves and wavelengths
Richard Hills - ESO, Atacama Large Millimeter Array (ALMA)

We’re all familiar with waves on the ocean and the idea of rollers coming in on the seashore. And the wavelength of a wave is the spacing between troughs and the crests in the waves.

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Richard Hills

Why I became an astronomer
Richard Hills - ESO, Atacama Large Millimeter Array (ALMA)

That just made me realize that with really quite simple pieces of apparatus you could do exciting things and find out stuff that was way outside our ordinary experience.

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Mike Holstine

Specifications of the Green Bank Telescope (GBT)
Mike Holstine - NRAO, Green Bank

The GBT is a spectacular structure. It is the largest, fully steerable radio telescope on the planet. It is one of the largest moving structures on land.

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Mike Holstine

History of the Green Bank Telescope (GBT)
Mike Holstine - NRAO, Green Bank

The GBT came about because we had a 300-foot telescope, a 300-foot transit telescope here at Green Bank which at one time was the second largest moveable telescope on the planet.

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