He’s been up in space for almost half a year and has six months to go before he returns home. Now you can send well wishes to NASA Astronaut Scott Kelly 250 miles above Earth.

Kelly and Russian cosmonaut Mikhail Kornienko left Earth in March and will spend a total of 342 days in space.

The White House is behind the move to send your notes to Kelly.

By embarking on a longer journey, Kelly and Kornienko are providing researchers an opportunity to better understand how the human body reacts and adapts to long-duration spaceflight.

The knowledge will be used as NASA looks toward human journeys deeper into the solar system including to and from Mars, a mission that could last 500 days or longer.

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