Based on the clue 'astronomers henry russell ejnar hertzsprung devis...', what is the answer?

Based on the clue 'astronomer william herschel wanted to call the sev...', what is the answer? Based on the clue 'astronomers classify these clusters of stars as el...', what is the answer? Based on the clue 'astronomers divide the sky into 88 of these star g...', what is the answer? What is associated with: astronomers gave this beatles inspired name to bpm 37093 a white dwarf star with a 2500 mile w… Based on the clue 'astronomers know that the name of this brown comes...', what is the answer? Based on the clue 'astronomers say theyve found 2 new planets one in ...', what is the answer? Based on the clue 'astronomers think the andromeda spiral may have on...', what is the answer? What is associated with: astronomers used clues in the text of this epic to figure out the date of its archery contest…