Chapter 13: The Changing View from Earth
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Retrograde Motion Made Easyhttp://www.scienceu.com/observatory/articles/retro/retro.html
What is retrograde motion? Find out about retrograde motion at this site - images, diagrams, and photos.
Planets in Motionhttp://zebu.uoregon.edu/textbook/planets.html
Watch movies of planetary orbits at this site, and learn more about Kepler and Ptolemy.
Voyager Now: Making Interstellar Exploration a Realityhttp://voyager.jpl.nasa.gov/
Where are the Voyager spacecraft today? This site is the Voyager project home page at NASA, and it will answer this question and lots more.
All About Voyagerhttp://ringmaster.arc.nasa.gov/voyager/voyager.html
There is lots of additional Voyager information to be found at this site.
Other Great Web Sites for Chapter 13
An excellent web site, including explanations for the seasons, graphic illustrations of the Sun and the planets, and descriptions of magnificent architecture that allowed ancient cultures to observe the solstices.
The Dance of the Planetshttp://vathena.arc.nasa.gov/curric/space/planets/dance.html
When we look up into the night sky we can see clouds, the Moon, stars, and even planets. They all seem to be moving at different rates and in different ways. What makes them move? Or is it we who are moving? Find answers at this site. Try the neat online activity called "dance of the planets."
You will really enjoy this site. It explores the findings of Johannes Kepler, one of the scientists who first discovered the Laws of Planetary Motion. Java applets let you experiment with changes in the orbital distances and see the effects on the speed of the planet orbiting the Sun.
NASA Photo Galleryhttp://nssdc.gsfc.nasa.gov/photo_gallery/
Would you like to see pictures of the planets and their moons and comets, taken from space? Click on these links to find them. Some are taken by the Hubble telescope and others by spacecraft.
A Multimedia Tour of the Solar Systemhttp://seds.lpl.arizona.edu/billa/tnp/
An overview of the history, mythology, and current scientific knowledge of each planet and the major moons in our solar system. Each page has text and images, some have sound and movies, and most provide references to additional related information.
Views of the Solar Systemhttp://planetscapes.com/
A vivid multimedia exploration of the Sun, planets, moons, comets, asteroids, and more. Discover the latest scientific information or study the history of space exploration, rocketry, early astronauts, space missions, and spacecraft.