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32. Radioactive dating techniques have revealed that our Ear…

32. Radioactive dating techniques have revealed that our Earth and Moon are approximately how old?

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32. Planets in the habitable zone of their stars:

32. Planets in the habitable zone of their stars:

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32. Which of the following stages will our own Sun go throug…

32. Which of the following stages will our own Sun go through in the future:

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15. Today, we believe that only a small number of elements w…

15. Today, we believe that only a small number of elements were actually formed during the Big Bang. Which of the following was NOT one of these:

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35. Astronomers estimate that there may be a trillion (a tho…

35. Astronomers estimate that there may be a trillion (a thousand billion) comet nuclei orbiting beyond Pluto. Why then do we not see more comets in our skies?

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9. Which color star is likely to be the hottest?

9. Which color star is likely to be the hottest?

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3. When astronomers discuss a nebula, what are they talking…

3. When astronomers discuss a nebula, what are they talking about?

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10. Which law do astronomers use to determine the masses of…

10. Which law do astronomers use to determine the masses of the stars in a spectroscopic binary system?

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5. Astronomers today know a lot about the size and shape of…

5. Astronomers today know a lot about the size and shape of the Milky Way Galaxy. Which of the following common objects most resembles the shape of our Galaxy?

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11. A star whose temperature is increasing but whose luminos…

11. A star whose temperature is increasing but whose luminosity is roughly constant moves in what direction on the H-R diagram?

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