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Today incredible images were beamed around the world of civilians walking in space \u2013 for the very first time.

All eyes were on businessman Jared Isaacman and engineer Sarah Gillis as they ventured outside a Space X capsule.

But is this an historic space exploration milestone - or just a very exciting holiday for a billionaire? We'll find out more from the BBC\u2019s own expert space-watcher Jonathan Amos.

Also this week, we visit Sellafield which processes and stores more radioactive material per square metre than any other site in Europe. But it is getting full.

So where is our nuclear waste going to go in future? As the UK searches for a new potential site, we look at the science of what we do with nuclear waste and why.

We\u2019ll also delve into the fascinating world of nuclear semiotics. How can we communicate the dangers of nuclear waste to people living 100,000 years from now?

Presenter: Vic Gill \nProducers: Sophie Ormiston & Gerry Holt \nEditor: Martin Smith \nStudio manager: Cath McGhee \nProduction Co-ordinator: Andrew Rhys Lewis