A thesis submitted to the

College of science, university of Baghdad

In partial fulfillment of the requirement for the degree of

PHD of science in Astronomy and space

By

Afrah Salah Mahdi

B.Sc. Astronomy and space (2013)

M.Sc. Astronomy and space (2016)

Supervised by

Prof. Dr. Ban Abd Al-Razzaq Abass

Dr.Maitham Abdullah Sultan

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