With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Arcade Fire's third studio album was The Suburbs.
text_B: Rachel S. Somerville is an American astronomer and holds the George A. and Margaret M. Downsbrough Chair in Astrophysics at Rutgers University .. astronomer. astronomer. Rutgers University. Rutgers University. She is known for theoretical research into galaxy formation and evolution .. She was awarded the 2013 Dannie Heineman Prize for Astrophysics. Dannie Heineman Prize for Astrophysics. Dannie Heineman Prize for Astrophysics. `` For providing fundamental insights into galaxy formation and evolution using semi-analytic modeling , simulations and observations . ''
not_related.