Ep. 123: Homogeneity

Podcast: Play in new window | Download (0.0KB) As astronomers discovered that we live in a great big universe, they considered a fundamental question: is the universe the same everywhere? Imagine if gravity was stronger billions of light years away… Or in the past. It sounds like a simple...

Ep. 122: How Old is the Universe?

Podcast: Play in new window | Download (0.0KB) We did a wildly popular three part series about the center, size and shape of the Universe. But every good trilogy needs a 4th episode. This week we look at age of the Universe. How old is the Universe, and how do we know? And how has this number changed...

Ep. 87: The End of the Universe Part 2: The End of Everything

Hopefully you've all recovered from part 1 of this set, where we make you sad about the future of the humanity, the Earth, the Sun and the Solar System. But hang on, we're really going to bring you down. Today we'll look far far forward into the distant future of the Universe, at timescales that we can barely comprehend. Episode 87: The End of the Universe Part 2: The End of Everything

Ep. 86: The End of the Universe Part 1: The End of the Solar System

This is a show we wanted to do since we started Astronomy Cast but we always thought it was too early. We wanted you to know that we're positive, happy people with enthusiasm for astronomy and the future. It's time for some sadness. It's time for a grim look to see what the future holds for the Universe. This week we stay close to home and consider the end of humanity, the Earth, the Sun, and the entire Solar System. Next week we'll extend out to the very end of the Universe. Episode 86: The End of the Universe Part 1: The End of the Solar System

Ep. 81: Questions on the Shape, Size and Centre of the Universe

As predicted we got a lot of questions from people about our trilogy of shows on the size, shape and centre of the universe. Today we'll do our best to clear them all up.As always, if you're still confused drop us an email to info at astronomycast dot com. Episode 81: Questions on the Shape, Size and Centre of the Universe (14.7MB)

Ep. 79: How Big is the Universe?

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? Episode 79: How Big is the Universe? (14.7MB)