How long can an astronaut stay in ISS?

– Xochielt Sanchez

Answer by Robert Frost:

"Can"?  We don't know.  Typically crew members stay for about six months.  This March, however, we will launch an astronaut (Scott Kelly) and a cosmonaut (Mikhail Kornienko) that will stay there for a full year.  By studying how they react in those second six months, we will gather more data that will help us understand how a two year journey to Mars will affect crew members.    Both Scott and Mikhail have previously spent 6 months aboard ISS.  Scott has a twin brother who is also an astronaut.  He will be studied on the ground as a control.

The record for a single stay in space was made 20 years ago, aboard the space station Mir.  Cosmonaut Valeri Polyakov was there for 437 days.

How long can an astronaut stay in ISS?

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