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What observation has prompted astronomers to ponder the possible existence of dark energy?
Q2: Jupiter radiates less heat than it absorbs
Q3: A tuning fork diagram is shown below.Which
Q24: Olympus Mons is 600 km in diameter
Q27: Which of the following nuclear fuels does
Q39: Why is the cosmic microwave background (CMB)so
Q43: Evidence for the drifting of continents or
Q47: _ in our Milky Way Galaxy's halo
Q50: The Andromeda spiral galaxy is almost edge-on
Q53: Seyfert galaxies are spiral galaxies with active
Q56: The largest satellite orbiting a terrestrial planet