Hello and welcome to Broconomics. Now, by popular demand, planetary scientist Grant Donahue is back and we're going to continue our thoughts on the whole big, wide, spacey stuff. So, Grant, thank you for coming back.

Very pleased that I'm apparently in, see what expression, by unpopular demand, I have returned. Yes. Well, if our audience like it,

then very good. You know, we've got to look after the audience, and we, because I mean,

they pay the bills and everything. They pay my bills anyway. Well, in fact, they don't pay my bills.

They mainly pay Carl's bills, but I'm sure you and I are getting something out of it somewhere.

Yes. There is that. I've managed to do I'm sure you and I are getting something out of it somewhere, yes.

There is that.

I've managed to do this one in the studio as well, which is nice.

We're moving up in the world.

I've got my Great British flag behind me, and you've replicated that energy, which is good.

That's exactly what we need.

So, right, our last couple of checks, we started off,

didn't we, with industrialising space, and we managed to go from low-arthil bit to the local cluster. So I think that was pretty much as excess. So good afternoon's work. Yes. And then in the second one, we thought, well, what are there aliens out there? And we had a long chat, and I think the conclusion was no bloody idea. Could be zero, could be many. I think if I had to bet on any number, I'd probably bet on zero.

Maybe a few microbes in the odd alien plants or something. But who the hell knows?

And in this one, we thought we might talk about living in space and a few other topics around that as well.

But I seem to remember we were going to start with sort of the limits of technology.

Because you made a sort of interesting point when we were communicating about doing this one,

that a lot of the technology just basically

hasn't got a shuffle on, you know, jet engines of the 1950s, not fundamentally that

different jet engines of today. What's your thinking there?

Well, there's a popular conception of engineering is downstream from physics.

And in many cases, that's true.

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