Task: Question Generation
Input (English): Context : What later became known as the Whirlpool Galaxy was discovered on October 13, 1773 by Charles Messier while hunting for objects that could confuse comet hunters, and was designated in Messier's catalogue as M51. 
Subject : Whirlpool Galaxy 
Relation : constellation
Output (English): The star/galaxy Whirlpool Galaxy is in what constellation?