Why selling off the International Space Station would be a tricky mission for the U.S.

The International Space Station is considered a shining example of the uniting power of science. Since the late 1980s, countries that were once at war with each other have worked together to further scientific research applied both on Earth and in space. But in its proposed 2019 budget released last month, the United States, the biggest financial backer of the ISS, indicated it will stop funding the station in 2025, and instead look at transitioning the orbiting laboratory to commercial enterprises.

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