O-type stars are the hot, blue Super Novas that explode and later come together to form black holes. M-type stars are cooler and have different attributes.

"The mnemonic is 'Oh, be a fine girl and kiss me,'" Nalini explained. "It goes back to Victorian times. Later, two other star types were discovered, L and T types, so I added the 'like that.'

"It started as a refrain and developed to a song. For me, astronomy becomes a metaphor for relationships and how a good relationship can go bad."