Sep 17, 2012 | 52:53Quirks and Quarks Dark Matter (April 1, 2000 Encore) Audio
Quirks and Quarks Dark Matter (April 1, 2000 Encore) Sep 17, 2012 | 52:53Dark Matter, AKA the Mystery of the Missing Mass, is the detective story of all detective stories. We think we know how the universe was created, and we have guesses about how old is might be...but we don't know what 90 percent of it is made of.
In the 1930s, astronomer Fritz Zwicky determined the only way to explain the gravity you could see affecting stars and galaxies, was to conclude there must be far more mass out there than what is detected by our telescopes. Astronomers call this mass "Dark Matter" and have been searching for it ever since. Lately, that search has been heating up. Scientists have constructed maps of the universe showing where there are concentrations of dark matter.
Sep 17, 2012 | 52:53Quirks and Quarks Multiple Worlds, Parallel Universes (April 16, 2005 Encore) Audio
Quirks and Quarks Multiple Worlds, Parallel Universes (April 16, 2005 Encore) Sep 17, 2012 | 52:53If you've ever read any science fiction, you've probably come across the idea of alternate realities: planets where life is almost the same as here on Earth, with just a few key differences. While the idea seems strange, it's one that some physicists are taking seriously. They're looking at the possibility that other universes exist in parallel with our own.
Sep 17, 2012 | 52:53Quirks and Quarks It's About Time (April 16, 2005 Encore) Audio
Quirks and Quarks It's About Time (April 16, 2005 Encore) Sep 17, 2012 | 52:53There was a time when time was a relatively simple thing. People were born, grew up, grew old and died. Days, seasons and years past. Then along came Newton and told us there was nothing in the laws of the universe that forced time to march forward. And Einstein developed this further with the idea that time could be stretched or shrunk, depending on how you looked at it. Now physicists are looking at the nature of time itself.