In August, the most spectacular meteor shower of 2017 coincides with transmission: The Perseids! If it's clear, it'll be a great chance to see scores of bright shooting stars streaking across the night sky. As those shooting stars vaporise in the atmosphere, a small part of some of them will fall to earth as dust.

This dust will contribute to a total of about 40,000 tonnes of space dust and debris that falls onto our planet every year. In this episode, Chris Lintott and Maggie Aderin-Pocock investigate this mysterious cosmic debris that comes from outer space.

Nearly 50 years ago, Neil Armstrong stepped onto the moon and it seemed like the dawn of a new age. Soon we'd be flying to the moon as effortlessly as we fly to America, and a moon base would be filled with men and women building a better future out in space. But then the moon fell out of fashion. We soon realized it was brutally inhospitable and getting there was eye-wateringly expensive. Rather than spend huge sums of money going where we'd already been, Mars and the other planets seemed much more exciting destinations. But now that is set to change. For the first time in a generation, there are credible plans to go back to the moon, and maybe even build a working moon base. The Sky at Night examines this renewed interest in the moon, and asks why it's happening now and who is at the forefront of this new wave of lunar exploration. They meet the tech companies driven by big ambitions to launch a new era of space exploration using private money. So, is a moon base really viable, or merely a pipe dream?