We're back with Season 3! For the next six episodes we're talking life in the universe, and so far we have N=1: we know there's life on Earth, but nowhere else as yet. Those are challenging statistics. In this episode Emily makes the case that to explore the possibility of life elsewhere in the cosmos, you need planets — and to have planets, you need stars. She then proceeds to whittle the number of potential life-bearing systems in our galaxy down to a scarily small number. But all is not lost, we still have five episodes to fill with hope and optimism.

On the web: syzygy.fm

Help us make Syzygy even better! Tell your friends and give us a review, or show your support on Patreon: patreon.com/syzygypod

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:

• Types of stars

• Stellar magnetism

• Multiple star systems

• Stellar metallicity

• The Galactic Habitable Zone

According to one survey, around one-third of Australians think aliens not only exist, but have actually visited Earth. That's ... a bit fraction. In this final episode of season 2, we ask how we'd even find out if life exists around other stars. Emily introduces the Habitable Worlds Observatory, an incredible new space telescope that's just in the early design phase and not due for years yet, with lots of technical and scientific holes to plug. Whether we can find life on other planets, who knows ... but maybe we've just found season three of Syzygy!

On the web: syzygy.fm

Help us make Syzygy even better! Tell your friends and give us a review, or show your support on Patreon: patreon.com/syzygypod

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:

• Habitable Worlds Observatory

• Square Kilometre Array

• SETI and Jill Tarter

• Jocelyn Bell Burnell and the first pulsar

• Roman Space Telescope

• Designs for the HWO

• Exoplanet biosignatures

Exo-planets, sure. Exo-moons and -comets? Fine. But exo ... telescopes?! Emily is going out on a limb in this episode, expanding the definition of telescope to include things that measure stuff in space, and we're here for it! Which means we really do have a few telescopes out there beyond the Solar System, in the shape of Voyagers 1 and 2, with a few more waiting in the wings.

On the web: syzygy.fm

Help us make Syzygy even better! Tell your friends and give us a review, or show your support on Patreon: patreon.com/syzygypod

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:

• The Voyager Missions: Voyager 1 and Voyager 2

• Where are the Voyager spacecraft now?

• The Heliosphere, where the Solar System ends

• The Voyager Golden Record

• NASA relieved to get a call from Voyager 1

• Syzygy Episode 42: Life, the Universe, and Everything

• Syzygy Episode 79: Voyager Hears a Hum

• Voyager 2 turns of last scientific instrument

• Uranus mystery finally solved!

• The Kuiper Belt and the Oort Cloud

• The Pioneer Program, esp. Pioneer 10 and Pioneer 11

• The Pioneer Plaque

• The New Horizons mission and the Pluto Heart image

• New Horizons visits Ultima Thule (Arrokoth)