In 1952, A Group of Three "Stars" Vanished. Astronomers Still Can't Find Them

In 1952, the Palomar Observatory imaged a close grouping of three point-like light sources, measuring 15th magnitude in brightness. It took another image an hour later, and the three objects had vanished. Follow-up observations scanned the area down to 21st magnitude and they were still missing. Now astronomers have used the 10.4-m Gran Terescopio Canarias, which should have seen anything brighter than 25.5 mag. Still nothing. What were they, and where did they go? The post In 1952, A Group of T...