How can astronomers estimate that there is at least 160 billion planets orbiting stars in the Milky Way galaxy?
A. with so many stars in the galaxy there must be an average of one or two per star.
B. Using the KELT telescopes even people in their backyard will be discovering and naming exoplanets.
C. Using the Transit Timing Variations method astronomers are suddenly discovering more planets than they imagined possible.
D. Astronomers base their estimates on the over 700 confirmed discoveries of stars with planets orbiting them. The discoveries indicate an average of 1.6 planets per star.
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