Pluto, Mars, Planet X, Dancer, Prancer, and Blitzen: Christmas Postcard From Flagstaff's Lowell Observatory

Percival Lowell, originator of the Planet X hypothesis (Photo credit: Wikipedia) On the cusp of Christmas, in a town ringed in part by Ponderosa pines and trailer homes dripping with holiday cheer, it’s easy to forget that Flagstaff is where Percival Lowell first seriously looked for putative canals on Mars. But near [...]