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Faced with years of congressional disinterest, NASA this week finally decided to close out its asteroid redirect mission.
The project was first pushed by President Obama as a mission to send astronauts to an asteroid. Then they downgraded it to using an unmanned spacecraft to bring a large asteroid back to lunar space, where astronauts would then visit it. Then they downgraded this to bringing back a small asteroid, which was later downgraded to bringing back a small boulder. In the process the manned mission got pushed farther and farther into the future, until it dwindled out of sight.
The mission never had any congressional support, so it was never going to happen. With the end of the Obama administration NASA can now finally stop making believe that it might happen and shut it down.