While we know from astrophysical observations that dark matter exists, its nature remains a mystery and its detection in the laboratory would be a major breakthrough. While the discovery of dark matter is still outstanding, in 2019 the experiment observed the decay of Xenon-124 atoms for the first time, with a half-life that is about one trillion times longer than the age of the universe. This makes the observed radioactive decay the rarest process ever measured directly.

Tags: Space & the Universe