__ describes the life cycle of a star.
A. Nuclear Fusion
B. Nebular Clouds
C. Stellar Evolution
D. The Big Bang
Question 2
According to the condensation theory, the most important factor for the formation of our planets was__.
A. The gravitational pull of the sun
B. The Interstellar dust attracting heat away from the protosun
C. The process of nuclear fusion
D. The nubular cloud condescending