Europe has built a powerful deep-sea telescope .

Europe has built a powerful deep-sea telescope called KM3NeT beneath the Mediterranean Sea to study mysterious particles called neutrinos and explore the universe’s most extreme events. It has two parts — ARCA near Sicily, which searches for high-energy neutrinos from space, and ORCA near France, which studies how neutrinos change form and their masses. In 2023, KM3NeT detected an ultra-high-energy neutrino event named KM3-230213A, about 30 times more energetic than any before. Scientists believe it may have come from cosmic explosions or black-hole jets. Because neutrinos can travel through space without being disturbed, they reveal secrets about the universe’s origin and why matter exists. Thousands of sensors on the sea floor capture their signals, and by 2027, KM3NeT may help solve one of science’s biggest mysteries — why there is something rather than nothing in the universe.