Kepler's third law: Galilean satellites

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http://www.flickr.com/photos/waiferx/3035594981/
Originally uploaded by Waifer X

Tracker chart for the Galilean satellites of Jupiter, adapted from the "Jupiter Moon Tracker Results" data from the NASA Planetary Rings Node website (http://pds-rings.seti.org/tools/tracker2_jup.html), used to determine the mass of Jupiter using Kepler's third law.