Today, we tackle the definitive science fiction question of our time: are we alone?

Sarah and Luke set out to discover who - or what - might be observing us from afar. We find that, while the chance of eventually meeting extraterrestrials is quite high, we've not yet found a way to surpass the unfathomable distances involved.

Joining us today are scientist and broadcast Seth Shostak and Bill Diamond, CEO of the SETI Institute.

Which inventions should we look into next? Let us know on Twitter @SarahCruddas @lukeaaronmoore @StakPod

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