NEW YORK (Reuters) - Two Americans have won the go-ahead to become the next tourists in space, and two more spots for a Russian rocket trip to the International Space Station are now on the market, the U.S. firm selling the spots said on Tuesday.

Two thrill-seeking civilians, whose names are still being withheld, have agreed to shell out $20 million each for separate eight- to 10-day trips into orbit.

These two space tourists won't be the first -- U.S. millionaire Dennis Tito and South African technology entrepreneur Mark Shuttleworth forked over about the same amount to be launched into space in 2001 and 2002.

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