Sketch the mass-radius plot for white dwarf stars and explain its importance

Write down the complete chain reactions involved in CNO-cycle

On the celestial sphere, show the diurnal circles of stars seen from the North pole

State Hubble's law. Estimate the age of the universe given that the Hubble's constant is 70 km/Mpc

Show the horizon coordinates of a star X on a celestial sphere for a location at latitude

60° N. Would these coordinates be the same at latitude 30° N?

What are sunspots ? Explain why the
temperature of the sunspots is lower than the
surroundings. Sketch the structure of a sunspot.
Explain what causes a solar flare.

What is meant by a degenerate gas ? How is it
different from an ideal gas ?
Assuming that the density of a star is uniform
and the star is in hydrostatic equilibrium, show
that
R « (M)^-1/3
where M is the mass of the star and R, its
radius. What is the significance of this result ?