NASA astronauts Butch Wilmore and Suni Williams have had their return to Earth delayed again, with a 10-day trip turning into a 10-month mission.

Former NASA astronaut Cady Coleman has first-hand experience on the International Space Station and explained to 6PR Breakfast hosts Millsy and Mick that, despite the unexpected delay, Butch and Suni are in an advantageous position.

“Every single thing they get accomplished up here takes us one step closer to going back to the Moon and understanding how people can stay safe on the way to Mars,” she said.

Click PLA Y to hear from the expert.

Image: Sydney Morning Herald/NASA/AP