A groundbreaking antimatter gravity experiment at CERN’s ALPHA-g tests whether antimatter falls in a gravitational field the same way as normal matter.

Antihydrogen atoms were captured in a Penning trap and cooled with lasers to near absolute zero to minimize motion that could obscure measurements.

Researchers gradually reduced the magnetic field to observe the antihydrogen’s vertical motion, filtering out cosmic-ray noise to determine the direction of the fall.

About four-fifths of the antihydrogen atoms fell through the trap’s bottom, lending support to the weak equivalence principle and Einstein’s idea that gravity acts universally.

Looking ahead, future high-precision measurements may detect tiny differences in gravitational acceleration between matter and antimatter, which would upend current physics.

Neutral antihydrogen was created by combining antiprotons with positrons, producing species unaffected by electric fields and suitable for gravity tests.

Overall results indicate antimatter falls similarly to matter in a gravitational field, though they stop short of proving identical acceleration; even a potential 1% difference would have profound implications.