Hello and welcome to another bonus episode of the Supermassive podcast from the Royal Astronomical Society.

With me, science journalist Izzy Clark, astrophysicist Dr. Becky Smeatherst, the Society's deputy director, Dr Robert Massey, and producer Richard Hollingham.

This is the place where we dive into the supermassive

mailbox and answer all of your fantastic questions that you sent in. Yeah, but you've covered a lot

of questions recently. Okay. So this episode, I'm bringing back the space book club. But to be

honest, I'm going to welcome exhibitions, film and TV recommendations. Oh, nice.

Some of us don't have time to read full books.

And when I say, some of us, I might mean me.

Yeah.

And me.

But before we do that, I thought we could have a check-in because it's been two years

since the first images from JWST. So I wanted to

have a look at, you know, what's happened in those two years? What have been some of the

latest discoveries? Because I think when we first had those images, we talked about Web all the

time. And we've moved on. We haven't checked in with them for a little while. So this is a good

opportunity to do that. So what have been some of the latest discoveries that have caught your

eye? Shall I start? Yeah. I mean, the one that strikes me is this ongoing Hubble tension,

which is still, I guess, not going to be uncontroversial, but the discrepancy between the scale and the rate of

expansion of the universe implied by Planck and looking at the cosmic microwave background and the

overall structure and what we see in terms of the redshift of galaxies. So what J.D.V.T has done is

looked at sephoid variables, which are stars that vary in a very regular way. So essentially the rate, the period,

the length of time of which they vary is related to their brightness. And therefore, if you see the

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