Before the 17th century, people generally believed that Earth was at the center of the universe, a system originally developed by Ptolemy. Galileo, however, was not afraid to challenge existing beliefs when he published...
The Moon is probably not humankind's final frontier. However, more than 30 years after the completion of the last lunar mission, the Apollo landings still stand out as six of the most ambitious and heroic voyages in...
Although the airless Moon experiences no weather analogous to terrestrial weather, conditions there are nothing short of extreme. This video segment recounts some of the experiences Apollo 16 astronauts had as they...
This exercise has students use a simple physical model of the Earth, sun, and moon to understand why the moon changes phases from the perspective of Earthly observers. Students hold up balls representing the moon in a...
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