In my February 28 post about the TRAPPIST-1 solar system, "Sun Bright and the Seven Planets," I wrote that "the nearest planet takes a couple of days to ground TRAPPIST-1." Oops! It should have read that "the nearest planet takes a couple of days to go around TRAPPIST-1." Sorry about that. The original typographical error, which I regret, has since been corrected.
Saturday, April 1, 2017
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