A SEARCH for X-ray emission from galactic objects on April 29, 1963, disclosed two localized sources, one of which appeared in Scorpius and the other in the direction of the Crab Nebula.

The challenge has previously asked observers to observe M1 the Crab Nebula and C39 the Clown Nebula ... and the spiral galaxy C48. Those in the Southern Hemisphere are encouraged to look for ...