* NASA trouble-shooting problem with station air-scrubber * Shuttle to depart station on Tuesday

By Irene Klotz

CAPE CANAVERAL, Fla., July 26 (Reuters) - A Canadian astronaut aboard the International Space Station said on Sunday it looks like Earth's ice caps have melted a bit since he was last in orbit 12 years ago.

Bob Thirsk, who is two months into a planned six-month stay aboard the station, said he is mostly in awe when he looks out the window, particularly at the sliver of atmosphere wrapped around the planet.

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