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Scott Kelly plays pingpong with a water droplet

Posted at 9:56 AM, Jan 22, 2016
and last updated 2016-01-22 09:56:59-05

This is the longest International Space Station mission in history. And it looks like they're having fun.

"Neat stuff," astronaut Scott Kelly said.

That's Scott Kelly playing pingpong. He's been on the ISS for 10 months.

He uses hydrophobic paddles. They work "kind of like a raincoat."

The ball is a water droplet in microgravity.

So what else are they doing?

"Our mission here is to understand the effects, mostly the effects on our physiology and psychology, of long-duration spaceflight, so we can eventually go onto Mars," Kelly said.

The one-year mission ends in March. (Video via NASA)