Main Menu > 1: The Mystery
	Part of the mystery? This movie is just one of many clues. (Click to launch movie.)
	Find out why Galileo's observations of sunspots in the 17th century were so controversial. Visit the Galileo Debate. Related to chapter 1 of the print guide. Scientists use the same techniques as detectives to solve mysteries. Related to chapter 1 of the print guide. Find out what Mysteries and Scientific Advances have in common. Related to chapter 1 of the print guide. A sequence of Galileo's sunspot drawings demonstrate the motion of sunspots across the face of the Sun. Related to chapter 1 of the print guide. Find out why it is so unusual to see the Northern Lights as far south as Tucson, Arizona. Related to chapter 1 of the print guide.
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