Take some time for yourself with soothing classical music from the mindful mix, the Science of

Happiness Podcast.

For the last 20 years I've dedicated my career to exploring the science of living a happier more meaningful life and I want

to share that science with you.

And just one thing, deep calm with Michael Mosley.

I want to help you tap in to your hidden relaxation response system and open the door to that

calmer place within. Listen on BBC Sounds.

Hello and welcome to a cosmic edition of crowd science from the BBC World Service,

the show that exists to solve your science mysteries.

This week we're pondering some planetary problems,

looking at everything from astronomy to the zodiac. I'm Marnie Chesterton and joining me are two people

with out of this world knowledge.

Panel, if you could introduce yourself.

Well, hello, I'm Carolyn Crawford,

and I'm the Public Astronomer at the Institute of Astronomy

at the University of Cambridge.

Hi, I'm Joe Marchant, and I'm a science journalist.

I've just written a new book called The Human Cosmos,

a secret history of the stars.

Now, usually on crowd science, we pick one question

and we dig deep, but so many listeners were curious about the

Cosmos we thought we'd tackle several of them. So let's start with our feet firmly on the ground

...