Physicist Lawrence Krauss says science can finally explain the age-old mystery: How can something come out of nothing? Or, to be more specific, how can the Big Bang pop out of empty space? Krauss also set off an intellectual brawl by saying theologians and philosphers have nothing useful to say about our cosmic origins. We’ll talk with Krauss and other physicists about science, religion and the meaning of life.
Copernicus changed the world with his revolutionary idea that the sun, not the Earth, is the center of our solar system. Dava Sobel tells us why this momentous discovery wasn't easy for Copernicus himself.
Do you need an advanced degree in math or physics to make discoveries about the cosmos? Science writer Margaret Wertheim says thousands of amateur scientists have proposed their own theories about the universe.