Author Question: Which of the following statements is true of reflection nebulae? A) They have a distinctive blue ... (Read 74 times)

debasdf · **on:** Jul 27, 2018

Which of the following statements is true of reflection nebulae?

A) They have a distinctive blue color.
B) The gases in reflection nebulae are excited to emit photons.
C) The spectrum of a reflection nebula is not the reflected absorption spectrum of starlight.
D) They are produced when a hot star excites the gas to produce an emission spectrum.

Question 2

_____ is a series of three nuclear reactions that builds a helium nucleus by adding protons one at a time.

A) The proton-neutron chain
B) The helium proton chain
C) The proton-proton chain
D) The hydrogen-helium chain