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.

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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:

• 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)