What is an ionization nebula?
A. a region of very hot, low-density gas surrounding a recent supernova
B. a clump of gas that will soon give birth to a new star
C. a colorful cloud of gas that glows because it is heated by light from nearby hot stars
D. a name sometimes used to describe spiral galaxies besides the Milky Way
Answer:C
What is an ionization nebula?
A. a region of very hot, low-density gas surrounding a recent supernova B. a clump of gas that will soon give birth to a new star C. a colorful cloud of gas that glows because it is heated by light from nearby hot stars D. a name sometimes used to describe spiral galaxies besides the Milky Way