Walkabout the Galaxy

The JWST has spotted water vapor in the hot inner region of a protoplanetary disk, the same region where rocky planets like are own are expected to form. This suggests water can be incorporated into terrestrial planets during formation, without relying on comet impacts. Much, much further away, a new interpretation of JWST results is consistent with dark stars. They are actually quite bright, but...

We think of aurora as an atmospheric phenomenon, but what happens when high energy particles from the Sun directly impact a planetary surface? Mercury reveals another cool planetary twist with auroral-like emission from its surface. Meanwhile, Jim and and Josh are gobsmacked by the old news of a big gravitational potential hump in the Indian ocean caused by upwelling of low-density magma far below...

Nature has provided us with exquisitely accurate clocks in the form of pulsars, those rapidly rotating neutron stars whose beams of radiation act like high-powered lighthouses across the galaxy. We discuss the amazing discovery of a deep, low, rumble of gravitational waves across the universe by analyzing the periods of 79 of those pulsar lighthouses. Closer to home, there's evidence for a major c...

Top quark has a field day in this episode with a model for fuzzy dark matter, new data that could shed light on dark energy, and a cool x-ray echo from the supermassive black hole at the heart of our galaxy. Closer to home, we take a look at how JWST is helping us determine if exoplanets have comfortable greenhouse effect atmospheres. Plus, we have a surprising spaceship trivia question and a spac...

New analysis of radioisotopes of meteorites and the Earth suggest the Earth formed in only a few million years via a process called pebble accretion. This may mean the Earth's water was incorporated early and gradually rather than through late impacts. Recent determinations of the historical length of the Earth's day suggest it stalled out at 19 hours for a cool billion years, and we still have a...

There's a bright supernova in a nearby galaxy, and a very distant supernova made brighter by the beauty of gravitational lensing. In another galaxy, a gargantuan black hole is revealed to be orbited by another supermassive black hole, resulting in a gamma ray flares as it rips through the main black hole's accretion disk. Closer to home, we learn about new asteroid missions and a rapidly warming p...

Lefty astroquark Jim Cooney leads us on an exploration of what it means for the universe to have chirality. In other words, is there a break in parity in the way galaxies are distributed, or would the universe look the same if we saw its mirror image? The answer and its possible explanation are fascinating. And Josh gets to once again talk about one of his favorite topics, Saturn's rings, and new...

We take a deep dive into the origin of Mars's moons and whether they are chips off the old block. There's no research to explain the mystery of why Mars and the rest of the planets are even here after billions of years, when the solar system seems to be inherently unstable. And astronomers may have caught a star in the act of gobbling up a planet in the first stages of the star's death throes. Cat...

We explore the strange ring system of dwarf planet Quaoar, and discuss a new study that suggests that Uranus's four largest moons (which aren't really very large!) may have subsurface salty oceans. In the astrophysical realm, black holes may have emerged from the chaotic soup of energy during the inflation era when the universe was not even minutes old. Add to that some nerdy computer trivia and y...

New calculations show how large impacts onto Mars may have boosted its greenhouse effect, helping explain how it was warm enough for all those rivers and lakes billions of years ago. If that explains Mars' early warm climate, it could be bad news for potential for life there. Futher from home, dust has been observed star forming regions in the Small Magellanic Cloud where the abundance of planet-b...

We return to Orlando Nerd Nite for a live recording where we take a look at the exciting upcoming missions to the Moon and the ESA mission to Jupiter's moons, JUICE, now on its 8 year journey to its destination. We revisit the amazing image of the supermassive black hole in the galaxy M87, now even amazing-er thanks to the clever implementation of artificial intelligence by some good old fashioned...

Space reporter Brendan Byrne becomes an honorary astroquark at MEGACON 2023 where we take a look at some of the recent and landmark discoveries of JWST, including the earliest supermassive black hole and a new era of studying exoplanets. Plus: Anime trivia!

That interstellar comet appears to have gotten its odd behavior from the natural rocket effect of hydrogen gas being released near the Sun and not, sadly, alien rocket technology. The universe is still a cool and interesting place, though, and a new clever measurement of stars orbiting black holes shows evidence for a pile-up of dark matter around the black holes, giving us another way to study th...

Compelling evidence for recent (1990's!) volcanic activity on Venus has been un-Earthed, or rather un-Venused, by Robert Herrick through analysis of Magellan radar data. A volcanic vent seems to have roughly doubled in size in 1991. We discuss the difficulties of these observations and the implications for future missions. We also take a look at the role of supermassive black holes in controlling...

What time is it on the Moon? It turns out the answer to that is not as easy as just lining it up with a time on the Earth. Worse, it's not even that obvious what time it is on the Earth. That's just one of many topics we explore in this episode, including a discovery that the Milky Way is much larger than previously thought, and tracing water molecules from the interstellar medium step by step int...

Learn about active asteroids and how the DART mission kind of turned an asteroid into an active asteroid, how impacts into Mercury have given it a dust trail, and we speculate about what might happen if Europa came to Earth. See title for conclusion! It's all about asteroids and dust and impacts on this episode of Walkabout.

Astronomers have sighted a supermassive black hole ejected from its host galaxy and creating a wake of stars from intergalactic gas. And if that wasn't enough to blow your mind, closer to home we've seen organic molecules in the material returned from the surface of a near Earth asteroid. Join us for all this, a weird exoplanet, Apollo program trivia, and some surprising tangents.

Where would you go and what would you bring with you if you could explore any object in the universe? Our cosmologist Jim Cooney wants to look for aliens underneath Europa's icy shell. This shell's complicated fractures may owe something to a new form of ice discovered in a delightfully simple experiment. Further out, a dwarf planet beyond Neptune has a ring unlike any we've seen before, and a del...

Neutrinos are slippery little buggers, and a new experiment is tightening the net to pin down their itsy-bitsy mass. Closer to home, the Earth's core is a complicated system with changing rates of rotation. We also take a look at the peculiar rings of a distant cometary body, Chariklo, thanks to a new observation by JWST. Join us for all the space news and Mars rover trivia.

Scientists have created a simulation of a wormhole in a quantum computer. Top quark helps us understand the significance of this as well as reminds us what the heck a wormhole is anyway. In planetary science, collisions may once again come to the rescue to help explain a mystery. This one is the odd gap in exoplanet sizes. And Down quark gives us an update on the Lucy mission to the Trojan asteroi...

Our own solar system is lacking in one of the most common types of planet, the Super Earth. These large rocky planets have a cookie-cutter characteristic that may be explained by the evolution of stuff in a forming system's disk. Speaking of disks, a mystery about the Milky Way its family of satellite galaxies seems to have been solved. Discover all this with updates from JWST, Artemis, a look ahe...

Top quark Jim Cooney rejoins the crew and gives us a deep dive into the breakthrough in nuclear fusion at the National Ignition Facility. Mars rover Perseverance is busy storing samples of Mars for a future mission to bring home, and the Sun may have a 17-year cycle in addition to the well-known 11-year cycle. Ring in the new year with the astroquarks to learn about all this, comet trivia, and mor...

The astroquarks get Down with it as we welcome Dr. Audrey Martin back as the Down astroquark for a discussion of the strange auroral phenomenon known as STEVE (for real), an odd gamma ray burst that may be the result of an unusual stellar merger, and updates on the successful Artemis 1 mission to the Moon.

Europa's got miniature tectonic activity, and a dark matter candidate may real itself through micro-gravitational lensing events. Dr. Audrey Martin joins us to discuss the strange spectra of the Trojan asteroids which have similar characteristics to comet dust tails. Join us for all this, silly particle name trivia, Artemis updates, and more.

Artemis 1, the most powerful rocket to ever leave the Earth, is up and on its way to the Moon after more hydrogen leaks than we care to remember, and Up Astroquark Dr. Hannah Sargeant signs off on her last Walkabout appearance as she is away to new adventures. We review the Artemis 1 mission, a new tracer for the origin of water on Earth and Mars, and we learn about a new idea for that famous dimm...