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UNDATED (CNN) -- Yosemite, Yellowstone, the Grand Canyon, and the moon? Two members of congress are pitching an out-of-this world idea to put a national park there.

Representatives Donna Edwards of Maryland and Eddie Bernice Johnson of Texas have proposed legislation to make the sites of moon landings as a national historic park.

Both congresswomen say their concern is protecting artifacts left by astronauts from future commercial development.

The national park designation would only apply to the American flags, lunar rover and other objects. That's because the moon's surface doesn't belong to the U.S. or any other nation, under an international treaty.

The moon park bill would also allow for corporate donations and foreign contributions to maintain the proposed park.

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