Retrograde motion a. is observable for planets located between ...

[go.lag]

Retrograde motion
 
  a. is observable for planets located between Earth and the sun.
  b. is observable for planets more distant from the Sun than is Earth.
  c. is only observable for the moon.
  d. is observable for all planets.
  e. none of the above

Question 2

____ is the thermonuclear fusion of hydrogen to form helium operating in the cores of massive stars on the main sequence.
 
  a. The CNO cycle
  b. The proton-proton chain
  c. Hydrostatic equilibrium
  d. The neutrino process
  e. none of the above

[jrpg123456]

Answer to Question 1

B

Answer to Question 2

A

[go.lag]

Gracias!

[apple]

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