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Yes, theoretical astrophysics is a branch of astrophysics.
Henry Cavendish with his Cavendish experiment.
Virginia Cavendish's birth name is Virgnia Cavendish Moura.
The Indian Institute of Astrophysics is an institute designed to basically train you in, and keep you focused on, astrophysics.
William K. Rose has written:
'Astrophysics' -- subject(s): Astrophysics
'The Letters of Wyndham Lewis'
'Advanced stellar astrophysics' -- subject(s): Astrophysics, Stars