Based on current understanding, what exactly is causing the expansion of the universe to accelerate?
A) WIMPs
B) neutrinos
C) white dwarf supernovae
D) Gravity
E) We don't know, but we call it "dark energy."
E) We don't know, but we call it "dark energy."
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Which form of radiation has the lowest frequency?
a. gamma b. microwave c. ultraviolet d. infrared e. visible
What do all of the inner planets have in common?
a. They all have rings. b. They all have abundant liquid water. c. They all have many moons. d. They all are small and have rocky surfaces
Why does the Moon lack a true atmosphere?
What will be an ideal response?
Which three branches of science are most important in our study of life in the universe?
A) physics, mathematics, and astronomy B) astronomy, planetary science, and biology C) planetary science, biology, and mathematics D) biology, mathematics, and physics