Why were Type I supernovae so critical in discovering dark energy?
What will be an ideal response?
These brilliant explosions are consistent standard candles, visible out to billions of light-years. Instead of finding the most distant galaxies slowing down as expected in a closed universe, the supernovae were even more distant than expected, as dark energy kept the universe forever expanding.
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Which of the following is not a terrestrial planet?
a. Earth b. Mars c. Saturn d. Venus
A solar or lunar eclipse will occur
a. when the sun is near the line of nodes of the moon and the moon is new or full. b. any time the moon is new or full. c. when the sun is near the solstice and the moon is new or full. d. half way through an eclipse year. e. when the sun is near the equinox and the moon is new or full.
If the Galactic Year is defined as the orbital period of the solar system, how long does it take us to circle the center? How do we know?
What will be an ideal response?
Which of the following molecules is the most polar?
A) HCl B) BrF C) CO D) Image