Astronomy: A Self-teaching Guide, Seventh Editi... -

He learned why it changed shape and how to spot the "seas" that were actually ancient lava plains.

He realized that the "star" that didn't twinkle near the horizon was actually Jupiter, and he felt a rush of excitement knowing he was looking at a giant world millions of miles away. The Turning Point Astronomy: A Self-Teaching Guide, Seventh Editi...