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Hydrostatic equilibrium refers to the balance between weight and pressure.
Q4: _ of hydrogen atom nuclei replace the
Q12: Discuss how astronomers know that our galaxy
Q13: A(n) _ is the expulsion of the
Q15: The pupil of the human eye is
Q38: The technique called _ uses a high-speed
Q38: We know the white dwarf star Sirius
Q68: Most of the visible light from the
Q91: X-rays easily penetrate Earth's atmosphere and reach
Q92: _ are produced when two galaxies pass
Q112: How does the study of quasars reveal