2026-05-06
21 分钟And now a word from our sponsor, South by Southwest London.
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Sometimes it's good to leave it all behind.
So for this episode, we're going far away, all the way to an object in the Kuiper Belt.
It's as far away as Pluto in the outer solar system.
And astronomers have been studying one of the rocks out there.
It's a big rock, but it's not a planet.
And they've been stunned to find that it has an atmosphere.
Can I go there now, actually, for a short break?
Yeah, this is a tiny thing.
It's only 500 kilometres in diameter.
And things that small are not supposed to be able to hold on to an atmosphere.
So that's the mystery.