20^th Century Exploration

This section covers the twentieth century and the important astronomical events and people from it. The people section covers the three most-prominent figures: Edwin Hubble, Albert Einstein, and Stephen Hawking. Earth & Moon Missions and Satellites discusses the programs that have studied the Earth and Moon by actually sending either a vehicle there or by sending people. It also talks about one of the most important satellites: the Hubble Space Telescope. Missions to Other Planets covers important probes, such as Pioneer 10 and 11, Voyager 1 and 2, and the Mars Global Surveyor, that have visited other planets or objects in the solar system.