8 mind-boggling numbers about Scott Kelly's epic time in space

On March 1, astronaut and Instagram star Scott Kelly returned to Earth after spending 340 days in space, a record for a NASA astronaut.

Kelly's nearly year in space has been a critical mission for NASA, helping to reveal details that will be key to future missions to Mars.

For example, understanding how the human body reacts to long-term stays in zero gravity will be crucial.

During his time in space, Kelly drank nearly 200 gallons of recycled urine and sweat and traveled over 140 million miles, according to The New York Times. Here are some more extreme numbers from The Times about Kelly's historic time in space:

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713 photos posted to Instagram — that's two posts a day on average.

#Water #YearInSpace #spacestation #iss #space

A photo posted by Scott Kelly (@stationcdrkelly) on Feb 28, 2016 at 2:32pm PST

915,000 Twitter followers, which he interacted with more than 2,000 times. Here's his Twitter profile picture:

5,440 orbits around Earth, while traveling at over 17,000 mph.