Walkabout the Galaxy

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Episodes

Date Title & Description Contributors
2025-03-26

  Life on Hycean Worlds, Interstellar Debris, and Dark Matter Survey

If there are Hycean worlds and if they have a certain kind of microbial life and if there is enough of it, JWST might be able to see the chemical products of that in the planet's atmosphere. We take a look at that, debris from neighboring stars enterin...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author
2025-03-19

  Are We Inside a Black Hole?

There are exciting new observations from recent lunar missions, a possible chunk of the Moon keeping us company, and an intriguing observation supporting the theory that the entire universe is inside a black hole! Get inside the event horizon with the ...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author
2025-03-05

  Oort Cloud Spiral, the Color of Mars, and a New Dwarf Galaxy

We take a look at the formation and structure of the Oort cloud of comets which is spherical at large distances but has a spiral structure in its inner regions. And, after all this time, there's a surprising twist on the nature of the iron mineral that...
  Josh Colwell, Addie Dove, Audrey Martin author
2025-02-26

  Did You Quipu?

Lunar exploration continues to accelerate, and there's a new longest "structure" in the universe. Quipu is a quasi-alignment of clusters of galaxies stretching over 1 billion light years. Structure is in cynical quotation marks because these objects ar...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author
2025-02-12

  Hubble Tension Won't Go Away But Some Exoplanets Do

The more measurements we make of the expansion of the universe, the more it seems as though Hubble Tension is not a problem with our data but a problem with our understanding of the expansion of the universe. We'll talk about that, and some cool new ob...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author
2025-01-29

  Exocomets, Io, and the Great Dimming of T Tauri

Juno reveals a surprise about the interior of Jupiter's volcanic moon Io, and the OG young variable star T Tauri is getting ready to fade from view thanks to its dusty neighbors to the south. Speaking of dust, that's what gets kicked up when comets col...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author
2025-01-22

  Little Red Dots and Big Black Holes

The discoveries from the James Webb Space Telescope keep coming. After showing that galaxies formed far earlier than we thought, we now have a better understanding of what was going on in the early universe. Those little red dots spied by JWST are actu...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author
2025-01-15

  Kiss and Capture for Pluto and Charon and Dark Energy Remains Dark

Pluto and its largest moon, Charon, orbit each other with gazes lovingly fixed on each other, held in place by a romantic tidal attraction. But Charon's large size has always been difficult to explain. New simulations show that their love affair may ha...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author
2025-01-08

  Quasi Particles, Pluto's Moons, and Cosmic Rays

We kick off 2025 with oddities from quasi particles, to cosmic rays, to the moons of Pluto. What has mass when it moves in one direction and doesn't when it moves in another direction? How do thunderstorms on Earth interact with cosmic rays? What is up...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author
2024-12-18

  Mysterious Dark Comets

We know about extinct comets and active asteroids, but now we've got something in between: dark comets, whose orbits indicate cometary activity, but we can't see it! We'll get the scoop on these interesting objects, a flare from a supermassive black ho...
  Josh Colwell, Addie Dove, Jim Cooney, Audrey Martin author