If the Sun and stars are supported by gas pressure, what supports a white dwarf? What will be an ...

If the Sun and stars are supported by gas pressure, what supports a white dwarf?
 
  What will be an ideal response?

Question 2

Possible equations (choose the correct one):  =1012/H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about
 
  a. 8.9 billion years.
  b. 13 billion years.
  c. 16.6 billion years.
  d. 26 billion years.
  e. 74 billion years.

Question 3

Why do many planetary nebulae show ring-like features on the sky instead of spheres?
 
  What will be an ideal response?

Question 4

If a galaxy is located at a distance of 18 Mpc and is found to have recessional velocity of 1170 km/s, what is Hubble's constant based only on this galaxy?
 
  a. 65 km/s
  b. 75 km/s
  c. 55 km/s
  d. 85 km/s
  e. 95 km/s

Question 5

What is the difference between a planetary nebula and a supernova remnant?
 
  What will be an ideal response?