If Mars' atmosphere is mostly carbon dioxide, why isn't it as hot as Venus?
What will be an ideal response?
Question 2
Which of the following phenomena is probably not related to the presence of a supermassive black hole?
A) the huge jets seen emerging from the centers of some galaxies
B) the radio emission from radio galaxies
C) quasars
D) the presence of globular clusters in the halos of galaxies