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Researchers have been able to measure several biomarkers in astronauts who went to space and found that exposure to radiation and antigravity significantly impacts immune function as well.

But antigravity avoids that problem, Chardin says, and it could also do away with two of the biggest puzzles in cosmology: the mysterious dark matter whose gravity keeps the galaxies intact and the even weirder dark energy that is stretching space and accelerating the expansion of the universe.

Gabriel Chardin, a cosmologist with CNRS, France’s national research agency, says, “It’s a beautiful experiment by outstanding people” and “a blow” to speculative theories that assume antimatter experiences antigravity—but not yet a fatal wound.

What’s more, even a tiny stray magnetic field could send a disproportionate number out the top of the trap, creating a spurious antigravity signal.

The data agreed much better with simulations in which the antihydrogen experiences ordinary gravity than those in which they experienced antigravity or no gravity at all, the researchers report today in Nature.