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Last year a separate team of researchers tested whether antihydrogen responded differently to gravity by seeing if it fell up or down when dropped.

"Many indirect measurements indicate that gravity interacts with antimatter as expected" he added, "but until the result today, nobody had actually performed a direct observation that could rule out, for example, antihydrogen moving upwards as opposed to downwards in a gravitational field."

In a unique laboratory experiment, researchers have now observed the downward path taken by individual atoms of antihydrogen, providing a definitive answer: antimatter falls down.

They observed that when the weakened magnetic fields were precisely balanced at the top and bottom, about 80% of the antihydrogen atoms annihilated beneath the trap -- a result consistent with how a cloud of regular hydrogen would behave under the same conditions.

In addition to refining their measurement of the effect of gravity, they are also studying how antihydrogen interacts with electromagnetic radiation through spectroscopy.