Author Question: The presence of elements heavier than helium in stars is very important because A) they provide ... (Read 195 times)

iveyjurea · **on:** Jul 27, 2018

The presence of elements heavier than helium in stars is very important because

A) they provide the raw materials for the formation of planets and life
B) without them they could not form
C) they help stabilize their interiors
D) they are responsible for the fusion reactions at their centers

Question 2

Which of the following is not consistent with recent observations of the cosmic microwave background by Planckt?

A) The universe is geometrically flat (in the four dimensions of spacetime).
B) The matter density (both luminous and dark matter combined) in the universe is only about one-fourth of the critical density.
C) Dark energy, whatever it is, represents the majority of the energy content of the universe.
D) The universe is at least 20 billion years old.