Marnie Ogg is director of the astro tourism company Dark Sky Traveller and the Australasian Dark Sky Alliance, an organisation dedicated to conserving the night sky and combating light pollution. She lives in Sydney.

Why hiking?
It has always been a big part of my life. When I was a girl, my family spent a lot of time in the great outdoors, and it was natural to include bushwalks; often I’d go by myself. Perhaps the love of long walks started in the Blue Mountains. My grandma lived there when I was a teenager and, probably to keep her sanity, she would send me and my brother, cousins and/or friends out on the bush trails around her house.