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

White dwarfs. The history of white dwarfs is a complex story and I need help, so I welcome

a professional astronomer. This is Ken Croswell, the author of The Outcoming of the Heavens,

searching for meaning in the Milky Way, writing most recently as Sky and Telescope magazine about

the white dwarf, the history of the white dwarf, which is very similar to the history of America,

because we go to 1783. You will recall that the Treaty of Paris that made America a sovereign

power was the same year. This is January 31st, 1783, and a very famous astronomer, English

astronomer William Herschel, points his telescope at 40 Eradani, or thereabouts. He's working on

other stars, but it's 40 Eradani that is the prize. Ken, a very good evening to you. What did he

see? What did William Herschel see? Good evening to you. Good evening, John. Well, William Herschel

was looking for double stars, and he succeeded. Actually, he more than succeeded when he looked at 40

Eradani. 40 Eradani is a faint star, just barely visible to the naked eye. It's what today we

would call an orange dwarf. It's a bit cooler and smaller than the sun. When William Herschel

pointed his telescope at 40 Eradani on January 31st, 1783, he saw two other stars, much fainter

than the main star, that were near it. Unfortunately, he never observed it again. It would have been

nice if he had, because that would help us deduce some things about the orbit of those two other

stars around each other. But those two other stars are visible to the naked eye. And so it's a

very, it's a triple, as we now realize, it's a triple star system. Triple system, it looks a little

fuzzy. We come to an astronomer, Giuseppe Piazi, who in the early part of the 19th century looked at

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