According to our theory of solar system formation, where did the comets of the Oort cloud form? ...

According to our theory of solar system formation, where did the comets of the Oort cloud form?
 
  A) in the inner solar system
  B) far beyond the orbit of Pluto
  C) in the region of the jovian planets
  D) in the asteroid belt

Question 2

Most of the planets discovered around other stars
 
  A) are more massive than Earth and orbit very far from the star.
  B) are more massive than Earth and orbit very close to the star.
  C) are less massive than Earth and orbit very far from the star.
  D) are less massive than Earth and orbit very close to the star.
  E) are found around neutron stars.

Question 3

The helium flash occurs at what stage in stellar evolution?
 
  A) when the T Tauri bipolar jets shoot out
  B) in the middle of the main sequence stage
  C) red giant
  D) horizontal branch
  E) planetary nebula

Question 4

If a star has a parallax of 0.05, then its distance in light-years is about
 
  A) 6.4 light-years.
  B) 12.7 light-years.
  C) 20 light-years.
  D) 65 light-years.
  E) 100 light-years.