Archive | Galaxies

Ep 491: Exoplanet Update 2018

Finally, a big update. Have there been news in the realm of exoplanets? More news that we can possibly cover. But we’ll try our best. We usually record Astronomy Cast every Friday at 3:00 pm EDT / 12:00 pm PDT / 19:00 UTC. You can watch us live on here on AstronomyCast.com, or the AstronomyCast […]

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Ep 490: What’s New with Supernovae

Time for another update, this time we’re going to look at what’s new with supernovae. And once again, we’ve got good news, lots of new stuff to report. We usually record Astronomy Cast every Friday at 3:00 pm EDT / 12:00 pm PDT / 19:00 UTC. You can watch us live on here on AstronomyCast.com, […]

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Ep 488: Dark Energy: 2018 Edition

The updates continue. Last week we talked about dark matter, and this week we continue with its partner dark energy. Of course, they’re not really partners, unless you consider mysteriousness to be an attribute. Dark energy, that force that’s accelerating the expansion of the Universe. What have we learned? This show was recorded Monday, 4/23/2018. […]

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Ep. 415: Temperature of the Universe

The temperature of the Universe can vary a dramatic amount from the hot cores of stars to the vast cold emptiness of deep space. What’s the temperature of the Universe now, and what will it be in the future? Download the show [MP3] | Jump to Shownotes | Jump to Transcript (more…)

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M81 in ultraviolet. Image credit: NASA

Ep. 414: Navigating Far

In our last episode, we talked about what it’ll take to navigate across the Solar System. In this episode we scale things up and speculate how future civilizations will navigate to other stars and even other galaxies. Download the show [MP3] | Jump to Shownotes | Jump to Transcript (more…)

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Ep. 408: Universe Cannibalism

We’ve talked about stellar cannibalism and galactic cannibalism, but now it’s time to take this concept to its logical extreme – universe cannibalism. In the multiverse theory of physics we live in just one of a vast range of universes which might interact with each other. Let’s look for the evidence. Download the show [MP3] […]

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Ep. 407: Galactic Cannibalism

Remember when we told you that the Universe is a big place, and anything that can go wrong, inevitably does? Today we talk about what happens when galaxies come together. This is particularly pertinent because our Milky Way will collide with Andromeda in the future! Download the show [MP3] | Jump to Shownotes | Jump […]

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Questions Show – light speed, Andromeda galaxy, dark matter and black holes

Another week, another roundup of your questions. This week listeners asked: will reaching light speed destroy the Universe? When is Andromeda going to look really, really cool with the unaided eye? Why didn’t dark matter all turn into black holes? And there’s even more. If you’ve got a question for the Astronomy Cast team, please […]

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Ep. 99: The Milky Way

The Milky Way is our home. An island of stars in a universe of other galaxies. But you might be surprised to learn that astronomers have only known the Milky Way’s true nature for just a century. Let’s learn the history of discoveries about the Milky Way, and what today’s science tells us. And let’s […]




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