Astronomer who hypothesized the existence of neutron stars, or insouciant MI6 spymaster from a Graham Greene novel? Maybe he's about to coin the term supernova, or maybe his contacts in Marrakesh are about to smuggle you to safety. Hard to say.
Astronomer Walter Baade was born #OTD in 1893. With Fritz Zwicky he introduced the term "supernova" and hypothesized the existence of neutron stars.
Image: George Stranahan / Caltech