Richard Fidler

Okay.

So if we imagine, we can imagine then Europa to some extent being a bit like some kind of, I don't know, frozen ice creamy treat with a kind of a frozen, something gooey underneath that and fluid.

Does it have a hard centre?

It's got a hard chocolatey centre, if you like, a rocky centre to it.

Do we know that or can we know that?

So what's going to be the path of the Europa Clipper?

Is it going to orbit around Europa or is that not even possible?

What do we know about the weather systems on Jupiter?

And is that a factor for you as well?

One of the pleasures of talking with people like you who do have an extraordinary job is to find out how you got from there to here.

You were born in Louisville, Kentucky in the United States.

Tell me about the family home for you as a little kid.

Who was in the family home with you?

Was the system smart enough to figure out that you were clever?

Was it smart enough at the time to go, were there teachers who took your mom aside and your grandmother aside and said, Tracy's actually very, very bright?

Were there signs early on that you were like that?

How supportive was your mum of that, of you taking on that much ambition for yourself?

Were you always aiming for the world of space?

Okay, here's the big, this is the toughest question I'm going to ask you today, Tracy.

For you as a kid...