Ep. 9: Einstein’s Theory of Special Relativity

It’s all relative. How many times have you heard that? Well, when you’re traveling close to the speed of light, everything really is relative; especially the passage of time. This week, Fraser and Pamela give you the skinny on Einstein’s Special Theory of Relativity. After listening to a few thought experiments, you too should be […]




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Ep. 8: Meteor Showers. Yes, the sky is falling.

Dress warmly, gather some friends and family, and head outside to watch sand burn in the upper atmosphere. There’s nothing like a good meteor shower. Fraser and Pamela explain this beautiful phenomenon: what causes them, the best storms and showers to watch for, and different types of meteors you might see. Download Episode 8: Meteor […]




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Ep. 7: Getting Started in Amateur Astronomy

Got your eye on that $40 telescope at Walmart? Wait, hear us out first! Fraser and Pamela discuss strategies for getting into amateur astronomy – one of the most worthwhile hobbies out there. We discuss what gear to get, where to look, and how to meet up with other astronomy enthusiasts. Download Episode 7: Getting […]




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Ep. 6: More Evidence for the Big Bang

Last week’s episode started out with a bang… a Big Bang. This week we continue our discussion into the beginning of everything. We present three additional lines of evidence that have led astronomers to the conclusion that our Universe started out as a singularity 13.7 billion years ago, and has been expanding ever since. Download […]




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Ep. 5: The Big Bang and Cosmic Microwave Background

As a tribute to John Mather and George Smoot, the two leaders of the Cosmic Microwave Background Explorer (COBE) satellite science team, and winners of this year’s Nobel Prize for Physics, we head back to the beginning of everything… the Big Bang. Follow as we trace the Big Bang’s discovery, and one of the most […]




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Ep. 4: The Search for Dark Matter

Dark matter . . . What is it? Nobody knows for sure, but it’s definitely there. Or maybe it’s not there, and we just need some redefinition of gravity at vast scales. Join Fraser and Pamela as we discuss the discovery, detection, and possible explanations of dark matter. Download Episode 4: In Search of Dark […]




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Ep. 3: Hot Jupiters and Pulsar Planets

You have lived on the Earth all your life, so you’d think you know plenty about planets. As usual though, the Universe is stranger than we assume, and the planets orbiting other stars defy our expectations. Gigantic super-Jupiters whirling around their parent stars every couple of days; fluffy planets with the density of cork; and […]




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Ep. 2: In Search of Other Worlds

Look down at your feet. There… you’re looking at a planet. Now look into the night sky and you should be able to spot a few more. After that, spotting additional planets becomes really hard, especially when you’re trying to find them orbiting other stars. This week we discuss the techniques astronomers use to locate […]




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Ep. 1: Pluto’s Planetary Identity Crisis

Pluto. It’s a planet, then it’s not. This week we review Pluto’s history, from discovery to demotion by the International Astronomical Union. Learn the 3 characteristics that make up a planet, and why Pluto now fails to make the grade. Download Episode 1: Pluto’s Planetary Identity Crisis (12.6 MB)




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Welcome to 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. Your questions can guide our discussion! Write us at questions@astronomycast.com and tell us what questions you want answered.




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