Episode 07 (supplemental): Octopuses from Space!

Episode 07 (supplemental): Octopuses from Space!

So, apparently, octopuses come from space. Or something. Emily and Chris chat about a ... curious ... paper that came out recently, which proposes an explanation for the Cambrian Explosion, the huge increase in diversity of life across the planet 500 million years ago. The suggested cause? Possibly viruses from space ... possibly octopus eggs in a meteor ... oh, who knows? It all seems a tad speculative but it's fun to discuss anyway.

Episode 07: Plumes of Ice on Europa

Episode 07: Plumes of Ice on Europa

Some astronomers found signs of great plumes of water erupting from the surface of Europa, one of the larger moons of Jupiter — and water could mean life, which has everyone jumping around in excitement. The best bit? They found the evidence buried deep in archived data from a 20-year-old space mission. See, *that's* why you don't just throw away old files — you never know what you'll find!

Episode 06: Galaxy Pile Up Causes Cosmic Chaos!

Episode 06: Galaxy Pile Up Causes Cosmic Chaos!

Astronomers have spotted a cluster of 14 galaxies far, far away, so piled up on top of each other, and so soon after the Big Bang, that they’re forcing the theorists to check back over their models and simulations of how the universe evolved. It’s an episode chock-full of big things, from galaxies, to clusters of galaxies, to superclusters, to filaments of superclusters … It’s all a bit overwhelming really.

Episode 05: Diamonds from Space!

Back in 2008 a large chunk of rock hurtled into the Earth’s atmosphere. Most of it burned up on the way down, but some fragments of the meteorite landed in the deserts of Sudan. When scientists open up those fragments and examined them under a microscope, they found something very interesting: tiny, tiny, diamonds. Nanodiamonds!

Ten years later, in April 2018, planetary scientists published a paper in Nature arguing that the structure of those nanodiamond crystals could only have come from one place: deep inside a planet — a planet that no longer exists in our Solar System.

Tiny diamonds from space? Planetary destruction? Chris and Emily are totally up for that.

Episode 03: Holding Our Breath For TESS!

After a quick listener question from Graham in Highfields, Australia, this week’s show is all about TESS: The Transiting Exoplanet Survey Satellite.

TESS is a brand new space telescope that, at the time of recording, was sitting atop a SpaceX Falcon 9 rocket, preparing for launch. Once in orbit, TESS will spend two years scanning almost the entire sky searching for exoplanets around stars in our local area of the Milky Way Galaxy.

Emily is particularly excited because the data TESS will send back will also contain loads of info for astronomers interested in variable stars, her own area of expertise.

So keep your fingers and toes crossed for a safe launch and successful mission. Go TESS go!

Episode 02: Dark Matter Is Out There, Even When It's Not

In the 1960s and 70s, astronomers measured the speed of stars and gas clouds orbiting at the edge of our galaxy, and discovered something strange: their rotational velocities were too fast. Way too fast. So fast, there’s no way the gravity from the visible mass in the galaxy could possibly keep them in orbit.

There was clearly some mass out there across the galaxy that astronomers couldn’t see. Like, more than three quarters of it. Awkward!

Astronomers call this invisible stuff Dark Matter, and fro decades the evidence has mounted for its existence across the universe. But in March 2018 astronomers found a galaxy with no Dark Matter at all … which, in a wonderful leap of logic, gives them even more confidence that this mysterious material exists.