Marnie Ogg, the founder of the Australasian Dark Sky Alliance, chats to Liam McAneny about her work on dark sky preservation.

They discuss the founding of the Australasian Dark Sky Alliance and the successful campaign to get Warrumbungle National Park certified as Australia's first dark sky park.

The pair also delves into the increasingly popular international dark sky movement, from the International Dark-Sky Association to energy activists turning off shop-front lights in London.

Finally, they touch on some of the biggest threats to our night skies, including light pollution, satellite mega-constellations and even space-based advertising.