I think I've soiled myself

Smile, but only if you're in the bright bit

simulation of Earth from Cassini

The space probe Cassini, which is in orbit around Saturn, will take a photo of Earth on Friday. You are invited to wave and smile.

But you needn't bother unless you're in that light bit on the left, for no one will see you.

Yes, I know, Earth will be little more than a dot. It's a joke; but don't fret, I'm not giving up the day job!