The crew at the International Space Station is celebrating an important milestone in space exploration.

Today marks the 15 year anniversary of human occupancy on the ISS.

The crew held a news conference to talk about the significance of spending that many years in space.

"The Space Station really is a bridge. It's a test bridge for the technologies that we need to develop and understand in order to have a successful trip to Mars," said Nasa astronaut Kjell Lindgren.

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