Ep 720: Galaxy Series – Elliptical Galaxies

Our galaxy series continues with elliptical galaxies. Unlike other types, these are large, smooth with very few distinguishing features. They’re filled with red and dead stars, a clue to their evolution. https://youtube.com/live/K9TuZ8RGb-Y

Our Hosts

Fraser Cain
Universe Today

Dr. Pamela Gay
CosmoQuest

Meet the Team

  • Richard Drumm, Audio Engineer
  • Ally Pelphrey, Video Engineer

Take a Listen!

17 seasons and more than 700 episodes await.

Ep. 714: Orbital Resonances

Ep. 714: Orbital Resonances

Several of the planets and moons in the Solar System are in orbital resonance, orbiting in a geometric lockstep. And not just the Solar System, astronomers have found the same resonances in other star systems.

Ep. 713: Solar System Volcanoes – An Update from LPSC 2024

Ep. 713: Solar System Volcanoes – An Update from LPSC 2024

Last week was one of the most exciting meetings we’ve seen from the Lunar and Planetary Science Conference, with hundreds of announcements and discoveries from various missions. One theme kept coming up, the Solar System is more volcanically active than we thought. Today, we’ll explore volcanism on other worlds.

Ep. 712: How Peer Review Fails

Ep. 712: How Peer Review Fails

You’ve probably heard that the best kind of science is peer-reviewed research published in a prestigious journal. But peer review has problems of its own. We’ll talk about that today.

Recent Episodes

Ep. 700: Things We Got Wrong

Astronomers talk about all the amazing discoveries they’re making but sometimes, it turns out, they were wrong. After decades and centuries of discoveries, how have they changed their minds? https://youtube.com/live/l1wyLzFEz2Q?feature=share This episode was made...

Ep. 699: Holiday Gift Giving Ideas for Astronomy and Space Fans

Just a warning, the holidays are rapidly approaching. It’s time, once again, to think about what to buy all the space nerds on your lists. Here’s what we like. https://youtube.com/live/wKbcQk2rDpM?feature=share Transcript (This is an automatically generated...

Ep. 698: Insights into the Universe, featuring JWST Results

Recorded live during the CosmoQuestX 2023 Hangout-a-Thon on November 5. How the time flies. It’s been over a year since JWST went operational, with other missions joining the fun. What new insights have we gained about the Universe thanks to these powerful new tools?...

Ep. 697 – Mission Roll Call Part 6: Outer Solar System

Finally, we reach the end of our tour through the missions in the Solar System. Out beyond Mars, to Jupiter the Kuiper Belt and Beyond. Recorded live during the CosmoQuestX 2023 Hangout-a-Thon. https://youtu.be/COkfhE2gkFI Transcript (This is an automatically...

Ep. 696 – Mission Roll Call Part 5: Science at Mars

Another week, another review of space missions in the Solar System. Today we set our sights on the red planet. What are all the active missions at Mars today? https://youtube.com/live/cGPS4kv3QoI?feature=share Transcript (This is an automatically generated transcript)...

Ep. 695 – Mission Roll Call Part 4: Lunar Exploration

Our journey through missions continues, this time we focus on the Moon. There are many nations on the Moon, near the Moon, around the Moon, travelling to the Moon. It’s a lot. We’ll talk about it today. https://youtube.com/live/iTA_aUI79do?feature=share Transcript...

Ep. 694 – Mission Roll Call Part 3: Sun, Mercury, and Venus

Our journey through space missions continues. Now we move away from the Earth to the rest of the solar system. What’s out there orbiting, roving and flying on other worlds and in interplanetary space. Today we look inward and we’ll talk about the missions studying the...

Ep. 693 – Mission Roll Call Part 2: Looking Outward from Earth

Last week, we brought you up to speed on the spacecraft which are helping to study Earth from above. Many of our missions are in Earth orbit but looking outward to study the Universe. Today, we’ll talk about the missions close to home, helping us understand our place...

Ep. 692 – Mission Roll Call Part 1: Orbiting Earth

It’s time for another series. This time we’re going to look at the missions that are currently in place across the Solar System. Today we’ll start with the key missions here on Earth, studying the planet from above and looking out into the Universe....

Ep. 691: Jupiter’s Changing Red Spot

Jupiter’s Great Red Spot is one of its most iconic features, first seen hundreds of years ago. Although it’s certainly long-lasting, it’s been changing in size over the last few decades, shrinking and changing in color. Is it fading away? And what can the changes tell...

Ep. 690: Climate on Mars – From Ice Caps to Dust Storms

We’ve looked at Earth’s changing climate, now let’s see what it’s like for another world: Mars. Much looks familiar, but some of it is totally alien, from ice caps of frozen carbon dioxide to planetary dust storms that can obscure the entire world from view....

Ep. 689: Our Warming World – 20 Years of Climate Science

It’s official! June and July were the warmest we’ve seen since records began over a century ago. Fires are rampant across Canada, and we’re seeing record droughts around the world. Today, we’re going to look at 20 years of climate science, how well does reality match...

Ep. 688: What’s Next? Looking Ahead to Season 17

Once again, we’ve reached the end of a season here on Astronomy Cast, and it’s time for the summer hiatus. But the Universe never takes a break. What can we expect to happen over the summer while we’re catching up on our reading, building our gardens and planning for...

Ep. 687: Prepping for the Moon

We’re going back to the Moon. In the next few years humans will set foot on the Moon again, ideally this time to stay. But this will be different than the Apollo era, going to the scientifically fascinating, and difficult southern pole of the Moon. What needs to be...

Ep. 686: Ice in the Shadows

The permanently shadowed craters on the Moon are the focus of so much research. That’s because they seem to contain vast reserves of water ice. Water we could use for oxygen, propellant and so much more, but also, to help us understand where the Earth’s water came...

Ep. 685: Manufacturing in Space

Launching satellites from Earth is counter-productive. You’ve got to make a satellite that can handle Earth gravity, then the brutal flight to space, then deployment in orbit. What if you could build your spacecraft in space?...

Ep. 683: Cosmic Dawn

After the cosmic microwave background radiation was released, the Universe returned to darkness, cloaked in this clouds of primordial hydrogen and helium. Gravity pulled these vast clouds into the first stars, and then the first galaxies. This is Cosmic Dawn, and JWST...

Ep. 682: Ultra-Diffuse Galaxies and Dark Matter

Astronomers first noticed the strange behaviors of rotating galaxies almost 100 years ago, suggesting there’s an invisible dark matter hold them together with gravity. Or maybe we just don’t understand how gravity works at the largest scales. Observations are much...

Ep. 681: Kilonovae

In 2017, astronomers detected the gravitational waves and electromagnetic radiation from colliding neutron stars. This had been long theorized as one of the causes of a certain type of gamma-ray burst. By studying the event and its afterglow, astronomers have learned...