| Physical Phenomenon |
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| SHOPPER'S DELIGHT | |
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Phenomena are usually associated with Change , but not necessarily immediately visible change. One of the goals of physics is to group phenomena into classes with common causes. For example, Isaac Newton observed that while an apple might fall from a tree, and the moon, very large and massive, does not fall from the sky, both phenomena are caused by Gravity . A related observation, made by Johannes Kepler after painstaking observations, was that the planet Mars also travels in an Elliptical orbit due to gravity. Another related observation, first made by James Bradley , an Astronomer , is that by carefully plotting the position of a nearby Star it appears to move in an Elipse over the course of a year. SEE ALSO REFERENCES
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