#745: How We Know if Asteroids Will Attack

New asteroids are found every day, and every day we learn that those asteroids don’t have any murderous intentions. But how do we learn that?

Our Hosts

Fraser Cain
Universe Today

Dr. Pamela Gay
CosmoQuest

Production by

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

18 Seasons

700+ Episodes

2018 Winner Parsec Award

#731: Neil Gehrels

#731: Neil Gehrels

Last week we talked about the Neil Gerhels Swift Telescope, this week we’ll be talking about the man behind the mission.

#729: The James Webb Space Telescope

#729: The James Webb Space Telescope

Let’s talk about that giant telescope that’s changing everything. We have been waiting our entire careers to make this episode on the James Webb Space Telescope, AKA the JWST.

Recent Episodes

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...

Ep. 680: Rogue Black Holes

Last week we talked about rogue stars. This week we’re going to take things up a notch and talk about an even more extreme event. Rogue black holes. Astronomers recently discovered a supermassive black hole on an escape trajectory, leaving newly forming stars in its...

Ep. 679: High(per) Velocity Stars

Most stars in the Milky Way are trapped in here with us, doomed to orbit around and around and around. But a few have found a way out, an escape into the freedom of intergalactic space. How do stars reach escape velocity, never to return?...

Ep. 678: World Building: Planet Formation, Growth, & Ejection

Okay sci-fi writers, today we’re going to give you a guided tour of building planets. How they form, how they grow, and how things can go horribly horribly wrong. https://www.youtube.com/watch?v=zJQ3BnCYiR4 Transcript (This is an automatically generated transcript)...

Ep. 677: The Answer is Always Dust

Whenever astronomers discover something surprising, the answer often turns out to be dust. Dust obscuring our view, dust changing the polarity, dust warming things up, dust cooling things down. It’s always dust. Until it isn’t....

Ep. 676: Other Things with Rings

We’ve spent a lot of time gushing about Saturn’s rings, but there are other places with ring systems. And not just Jupiter and the ice giants, but asteroids, dwarf planets, centaurs and even exoplanets. Today we’ll gush about them....

Ep. 675: Exotic Forms of Ice

Ice is ice, right? You know, what you get when water freezes. Well, maybe here on Earth. But across the Universe, water can be squeezed together at different temperatures and pressures, leading to very different structures. Today we’ll talk about the different forms...

Ep. 674: Asteroid Early Warning Systems

The asteroid apocalypse is one of those existential crises that keep astronomers up at night. But the DART mission showed us that we can push an asteroid off its trajectory if we have enough warning. Today we’ll talk about how humanity is building early warning...

Ep. 673: How to See Satellites (or Avoid Seeing Them)

If you’re in dark skies and look up, you’re certain to see a satellite. Lots of them. But how can you know which one you’re seeing, and how can you improve your chances of a sighting? Today we’ll talk about how to see satellites, or avoid seeing them....

Ep. 672: Space Debris Removal

We’ve talked about the rising problem of space junk. Okay, we know it’s an issue. So what can be done about it? Today we’ll talk about ideas to remove space junk, making sure space is open to use for the centuries to come. https://www.youtube.com/watch?v=Q7RxmX5eDY4...

Ep. 671: The Consequences to Breaking Space Laws

https://www.youtube.com/watch?v=Wni5--mzw2Q Last week we talked about the laws that govern space exploration. This week the rubber hits the road. What are the consequences for actually breaking these rules? Are they really going to stop anyone? Download MP3 | Show...

Ep. 670: Governing Space – The Outer Space Treaty of 1967

https://www.youtube.com/watch?v=LZOYKDGglo8 The Universe was inaccessible for most of human history, but the first tentative steps to space in the 20th century made humanity realize that science fiction was becoming science reality. New rules would have to be written...

Ep. 669: Challenges to Dark Energy

https://www.youtube.com/watch?v=5_1L_P24gT4 It’s been over 20 years since astronomers first discovered that the expansion of the Universe is accelerating thanks to dark energy. And in these decades, astronomers still don’t have much evidence for what could be causing...

Ep. 668: The Crisis in Cosmology

https://www.youtube.com/watch?v=2n6HKpWaEEE Astronomers have made extremely accurate measurements of the expansion rate of the Universe and come up with different results. And the error bars for the observations don’t overlap, so there’s something strange going on....