"Einstein-Rosen caterpillar" is a keeper! Sabine discusses some recent papers on so-called wormholes, mysterious tunnels in space-time which are mathematically possible according to Einstein´s theory and would (perhaps) make time travel possible. Not to mention travel between two regions very far apart in "normal" space. Which is why wormholes play such a central role in both science fiction and various cornucopian speculations.
There´s just one tiny little problem: there´s no actual evidence that wormholes are physically real. And as far as I understand, many scientists argue that if they are are, they are extremely small and almost invisible.
And as far as scy fy is concerned, well, doesn´t the Fermi paradox apply equally much to a cosmos with hypothetical wormholes as one without them? If there really are cosmic tunnels out there, large enough to let some interstellar spaceship through: hey, where is everyone?
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