What do a UP town, a physicist and a Bihar town have in common? Hint: Mars

​Lal, Mursan and Hilsa are three craters on the surface of Mars, discovered by Ahmedabad's Physical Research Laboratory (PRL), that could hold proof that there was water on the red planet at some point in the past. ​The biggest crater of the three - Lal - has been named after the late Professor Devendra Lal, a legendary cosmic ray physicist from Varanasi and the director of PRL between 1972 and 1983.