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My name is Shun. I am the Found World Target Trition.

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This is CBS I on the World with John Bachelor. Here's John Bachelor.

This is CBS I on the World. I'm John Bachelor. I welcome Dr. Ken Croswell, author of the

Alchemy of the Heavens searching for meaning in the Milky Way to take us to the Milky

Way. A galactic enterprise can as long admired as beautiful and he now writes in the proceedings

of the National Academy of Sciences. A revelation about the Milky Way, about our place in it,

our solar system, can a very good evening to you. The Milky Way is a spiral galaxy, but

to do some history, the revelations of spiral galaxy you date to the mid-19th century,

the whirlpool galaxy. That was sometime before we could perceive our own galaxy because

we're inside that spill of stars across the sky. What did the whirlpool galaxy teach us?

What does it mean to be a spiral galaxy? Good evening to you.

Good evening, John. The whirlpool galaxy is a stunning spiral galaxy. It's still one

of the most beautiful galaxies we know. There's a picture of a great picture from Hubble

that appears in my article in the proceedings of the National Academy of Sciences. We discovered

a spiral structure in 1845, where I should say Lord Ross in Ireland was the first to make

...