Photo: SEBASTIAN KAULITZKI/SCIENCE PHOTO LIBRARY
In the race to colonize Mars, millions - if not billions - of dollars have been poured into research by people like Elon Musk to see what would make the planet's environment less hostile for humans.
But why not spend the money improving conditions on Earth instead? What is driving this obsession?
Writer Danyl McLauchlan joins Susie to tackle life's big questions, ideas and thinkers.
