Johnson, Gaylord · New York, The Macmillan company · leaf 173
polarcaps well, even in a powerful telescope.This is when he is on the oppositeside of his path from us, near the su-perior conjunction position we learnedabout. It is when Mars is on thesame side of the sun with us that heis biggest and plainest. That is thetime astronomers study the polar capsand… … Do Mercury and Venus wear polar caps too?asked Betty. No/ said Uncle Henry, there is very little tosee through a telescope on either Mercury or Venus.Their changes in phase/ from full to crescent andback again are the main things about them/ Puck waved his wand of straw across the pictureon the…
Astronomy
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