Astronomy Cast
Astronomy Cast offers you a fact based journey through the cosmos. Each week Fraser Cain (Universe Today) and Dr. Pamela Gay (SIUE / Slacker Astronomy) take on topics ranging from the nearby planets to ubiquitous dark matter.
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Ep. 383: Approaches to Absolute Zero
The coldest possible theoretical temperature is Absolute Zero, this is ...
The coldest possible theoretical temperature is Absolute Zero, this is the point at which no further energy can be extracted from a system. How are physicists working to get as close as possible to this extreme cold?
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Ep. 382: Degenerate Matter
In some of the most extreme objects in the Universe, ...
In some of the most extreme objects in the Universe, white dwarfs and neutron stars, matter gets strange, transforming into a material that physicists call “degenerate matter”. Let’s learn what it is, how it forms.
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Ep. 381: Hollowing Asteroids in Science and Fiction
When we finally make the jump to fully colonizing the ...
When we finally make the jump to fully colonizing the Solar System, we're going to want to use asteroids as stepping stones. We can use them as way stations, research facilities, even as spacecraft to further explore the Solar System. Today we'll talk abo
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Ep. 379: Fermi's Atom Splitting
When he wasn’t puzzling the mystery of alien civilizations, Enrico ...
When he wasn’t puzzling the mystery of alien civilizations, Enrico Fermi was splitting atoms. He realized that when atoms were split, the neutrons released could go on and split other atoms, creating a chain reaction – and the most powerful weapons ever d
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Ep. 380: The Limits of Optics
Astronomers rely on the optics of their instruments, and there ...
Astronomers rely on the optics of their instruments, and there are some basic limits that you just can’t avoid. Whatever we look at is distorted by the optics, in fact, a basic property of light means that we’ll never get perfect optics. Here’s why we can
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Ep. 378: Rutherford and Atoms
Physicists knew the interior of the atom contained protons, neutrons ...
Physicists knew the interior of the atom contained protons, neutrons and electrons, but they didn’t understand exactly how they were organized. It took Ernest Rutherford to uncover our modern understanding.
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Ep. 377: Thomson finds Electron
At the end of the 19th century, physicists were finally ...
At the end of the 19th century, physicists were finally beginning to understand the nature of matter itself, including the discovery of electrons – tiny particles of negative charge that surround the nucleus. Here’s how J.J. Thompson separated the electro
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Ep. 376: The Miller-Urey Experiment
Evolution explains how life adapts and evolves over eons. But ...
Evolution explains how life adapts and evolves over eons. But how did life originate? Chemists Miller and Urey put the raw chemicals of life into a solution, applied an electric charge, and created amino acids – the building blocks of life.
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Ep. 375: The Search For Life in the Solar System
With the discovery of water ice in so many locations ...
With the discovery of water ice in so many locations in the Solar System, scientists are hopeful in the search for life on other worlds. Guest Morgan Rehnberg returns to Astronomy Cast to explain the best places we should be looking for life.
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Ep. 374: Stern-Gerlach Experiment
In the world of quantum mechanics, particles behave in discreet ...
In the world of quantum mechanics, particles behave in discreet ways. One breakthrough experiment was the Stern-Gerlach Experiment, performed in 1922. They passed silver atoms through a magnetic field and watched how the spin of the atoms caused the parti
