A collaboration between the NIST Center for Neutron Research and CNAM has led to a novel discovery of a new spin-triplet superconducting phase in the actinide compound UTe2. Discovered by postdoctoral researcher Sheng Ran, this novel state exhibits striking features that are unmatched in any known superconductors, including an unprecedentedly strong resistance to magnetic fields and evidence for Cooper pairs of electrons with an aligned spin state, called spin-triplet pairing. Because such superconductors potentially harbor a non-trivial topology of their pairing wavefunction, UTe2 is likely to be a topological superconductor, which is both rare and extremely promising for quantum technologies. This work is published in Science.