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View Resource The Wall of Time

The development of our solar system can be viewed as a continuous and complicated process that started about 4.6 billion years ago. As scientists continue to study the solar system, and Earth in particular, their understanding of the sequence of events that led to the planetary conditions we see today continues to gain detail and clarity. This illustrated timeline from the Lunar and Planetary...

View Resource Astronomy Animations

This collection of animations introduces students to planetary motions, gravitational effects, and the scale of astronomical distances. Students can view visualizations of Earth's changing seasons, circumpolar motion, and the celestial equator and ecliptic plane. Animations on gravity explain how satellites orbit, the motions of comets and meteor storms, and gravitational 'warping'. Other...

View Resource The Round Earth and Christopher Columbus

This web page, created by David P. Stern, describes observations that show the earth is a sphere and the history of these observations. The round shape of the Earth may be inferred from the existence of a horizon at sea. Ancient Greeks deduced it from the shape of the Earth's shadow when the Moon is eclipsed and from stars visible only in southern countries. Eratosthenes accurately estimated the...

View Resource ASTR103-Class Note

This website, created by J.C. Evans of George Mason University, contains lecture notes that incorporate introductory information on astronomy. Topics that the lecture notes cover include: earth/sky relations, historical astronomy, celestial mechanics, matter, radiation, the solar system, the sun, stars, stellar evolution, relativity, galaxies, large scale structure of the universe, and...

View Resource American Geophysical Union

The American Geophysical Union (AGU), which was established in 1919 by the National Research Council and for more than 50 years operated as an unincorporated affiliate of the National Academy of Sciences, is now a nonprofit corporation chartered under the laws of the District of Columbia. The Union is dedicated to the furtherance of the geophysical sciences through the individual efforts of its...

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