When the German Space Agency (DLR) and European Space Agency (ESA) unveiled their version of the moon, the LUNA Analog Facility, they got two-thirds of the way to representing the moon's strange landscape.
Equipped with long-handled scoops, a sample trolley and robotic dog, the scientists pretended to explore the fake lunar surface in front of about 100 dignitaries.
But they walked - they didn't bounce as in footage from the 1969 Apollo 11 mission - because LUNA has no lunar gravity. It's a problem the engineers have yet to solve.
In the past, astronauts have used parabolic flights and swimming pools to simulate and experience the effects of zero or microgravity.
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