On May 6, 1968, more than a year before he walked on the moon, Neil Armstrong narrowly escaped disaster during training. See Neil Armstrong's close call here.
Alan Shepard became the 1st American in space on May 5, 1961. His suborbital flight took place just 3 weeks after the Soviet Union's Yuri Gagarin orbited Earth.
A Jupiter-like exoplanet with water-ice clouds? NASA's Webb space telescope has found the 1st signs of cirrus-like clouds on exoplanet Epsilon Indi Ab.
Dutch astronomer Jan Oort was born on April 28, 1900. He visualized a vast reservoir of icy comets on the fringes of our Solar System, which now bears his name.