____________________ Are Comparatively Cool, Dark Regions on the Sun's Surface

Q9: A _ is a large volume of

Q10: How big is the Sun's core and

Q11: Within a star, gravity pulls particles inward,

Q12: The process of absorption, emission, and convection

Q13: Describe sunspots.

Q15: The _ brightness of a star decreases

Q16: What do astrophysicists call the poorly understood

Q17: Describe a red giant.

Q18: Describe the radiative and convective zones.

Q19: Hubble's law states that the _.<br>A) most