Time to put your helmet on … Now it’s time to leave the capsule if you dare.

Colonel Tim Kopra (US) on the left and Major Tim Peake (UK) on the right in the ISS.

The UK’s Major Tim Peake is, as I write, enjoying his first space walk outside the International Space Station. He has today become the first Briton to undertake a space walk under the British flag. Woop woop.

I heard at the end of BBC Radio 4’s World at 1 a lovely exchange as Tim stepped out of the ISS:

Tim Peake: Okay, I’m coming out.

Tim Kopra: Okay.

TP: Beautiful sunset.

TK: Oh, I know.

Reid Wiseman: Tim, it’s really cool seeing that Union Jack go outside, since it’s explored all over the world, now it’s explored space.

TP: It’s great to be wearing it, a huge privilege. A proud moment.

That was a really nice touch by Reid Wiseman, the astronaut guiding Tim Peake and Tim Kopra from mission control at NASA.

The 6-hour long space walk is being live blogged by the BBC, but even better, you can watch it live on NASA Television.

And just because: