Podcast: Questions about the Size, Shape and Centre of the Universe

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As predicted, we had a huge number of listener questions after our puzzling trilogy about the nature of space itself. Is the Universe really a big donut? Could you see the same star in all directions? If the Universe is expanding, there must be an edge? Right? Listen in as we decrease the number of headaches by 5, and get a special bonus explanation you can use on the dark matter deniers in your life.

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Questions about the Size, Shape and Centre of the Universe – Show notes and transcript

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Podcast: Craters

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Pamela’s attending the 39th Lunar and Planetary Sciences Conference, and you know what that means: the Moon… and planets! When you think of the Moon, you think of craters. In fact, that’s a big theme this week at the conference, so Pamela took it as inspiration. Here you go, the week we drove the show into a crater. Wait… there’s got to be a better way to describe this.

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Craters – Show notes and transcript

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Podcast: How Big is the Universe?

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We’re ready to complete our trilogy of discovery about the universe. We’ve learned that it has no center; rather everywhere is its center and nowhere. We discovered that the universe seems to be flat. It’s not open, it’s not closed, it’s flat. If that doesn’t make any sense, you need to listen to the previous show because there’s no way I could give that an explanation.

So now we want to know: “How big is it?” Does it go on forever or is it finite in scale? How much of it can we see?

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How Big is the Universe? – Show notes and transcript

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Podcast: What is the Shape of the Universe?

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Some of the biggest questions in the universe depend on its shape. Is it curved? Is it flat? Is it open? Those may not make that much sense to you, but in fact it’s very important for astronomers. So which is it? How do we know? How did we figure it out? Why does it matter?

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What is the shape of the Universe? – Show notes and transcript

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Podcast: Where is the Centre of the Universe?

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There are some people – I’m not naming names – who think the universe revolves around them. In fact, for most of humankind, everybody thought that. It’s only been in the last few hundred years that scientists finally puzzled out that the Earth isn’t the centre of the universe at all. That begs the question: where is the centre?

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Where is the Centre of the Universe? – Show notes and transcript

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Podcast: Lagrange Points

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Gravity is always pulling you down, but there are places in the solar system where gravity balances out. These are called Lagrange points and space agencies use them as stable places to put spacecraft. Nature is on to them and has already been using them for billions of years.

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Lagrange Points – Show notes and transcript

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Podcast: Stellar Populations

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After the Big Bang, all we had was hydrogen, a little bit of helium, and a few other trace elements. Today, we’ve a whole periodic table of elements to enjoy, from oxygen we breathe to the aluminum cans we drink from to the uranium that powers some people’s homes. How did we get from plain old hydrogen to our current diversity? It came from stars; in fact, successive generations of stars.

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Stellar Populations – Show notes and transcript

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Podcast: Antimatter

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Sometimes, we don’t get to decide what our show’s about. So many threads come together at the same time driving the decision for us. This is one of those situations. We’ve gotten so many questions from listeners in just the last week about antimatter that our show had just been chosen for it. You command, we obey. Let’s talk about antimatter.

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Antimatter – Show notes and transcript

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Podcast: Questions Show #8

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We’ve been so crazy following our own whims through the universe that we’ve neglected your questions. That ends today. It’s time to dig deep into our overflowing email box to retrieve the puzzling questions our listeners have sent in.

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Questions Show #8 – Show notes and transcript

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Podcast: Cosmic Rays

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We’re going to return to a long series of episodes we like to call: Radiation that Can Turn You Into a Superhero. This time we’re going to look at cosmic rays, which everyone knows made the Fantastic Four. These high-energy particles are streaming from the Sun and even intergalactic space, and do a wonderful job of destroying our DNA, giving us radiation sickness, and maybe (hopefully!) turning us into superheroes.

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Cosmic Rays – Show notes and transcript

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