Exoplanets, sure. Exo-moons too, apparently. But exo ... comets?! Yes indeed, they're a real thing, and we've known about them for ages! How do you spot something so tiny around another star, so far away? Emily has the insider knowledge, because it's something she's genuinely investigating in her job as an actual, real-life astronomer.

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Syzygy is produced by Chris Stewart and co-hosted by Dr Emily Brunsden from the Department of Physics at the University of York.

Some of the things we talk about in this episode:

• Comets: dirty snowballs

• Exocomets

• Famous comets

• Shoemaker-Levy’s Jovian rendezvous

• Beta Pictoris, HyperMegaMall of astrophysics

• Exocomets around Beta Pic

• TESS, everyone’s favourite exo-hunter