Briefly explain how the Sun became hot enough for nuclear fusion. ...

[mrsjacobs44]

Briefly explain how the Sun became hot enough for nuclear fusion.
 
  What will be an ideal response?

Question 2

In light of modern solar system theory, why do the orbits of the planets all lie in the same plane?
 
  A) The Sun's gravity forced them into these orbits.
  B) The angular momentum of the solar system was kept to a minimum this way.
  C) The early solar nebula flattened into a disk.
  D) Comets would have wiped out any not in this protected plane.
  E) This happened purely by chance.

[Joy Chen]

Answer to Question 1

The Sun formed from a cloud of gas. As it contracted, its gravitational potential energy was converted to thermal energy. The Sun continued to contract until the core became hot enough to sustain nuclear fusion.

Answer to Question 2

C

[mrsjacobs44]

Thank you!

[Joy Chen]

Always glad to help...