The Russian astronaut heading off for a year in space says he'll miss the natural landscapes on Earth. His American counterpart jokes he won't miss his twin brother.

Russians Mikhail Kornienko and Gennady Padalka and American Scott Kelly are to launch Friday aboard a Soyuz space capsule for the International Space Station. Kelly and Kornienko are to stay there until March 2016, while Padalka will be on a six-month mission.

At a news conference Thursday at the Russian manned-space facility in Baikonur, Kazakhstan, Kornienko said "we will be missing nature, we will be missing landscapes, woods."

Kelly was asked if he'd miss his twin brother Mark, who's also an astronaut.

"We're used to this kind of thing," he said. "I've gone longer without seeing him and it was great."