Image: GPB circling earth
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Description: Artist concept of Gravity Probe B orbiting the Earth to measure space-time, a four-dimensional description of the universe including height, width, length, and time.
Title: GPB circling earth
Credit: http://www.nasa.gov/mission_pages/gpb/gpb_012.html
Author: NASA
Permission: Original work of NASA
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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