Unformatted text preview: 2) From the Greek root of the word planet, the 5 planets, the moon and the sun _________________ with respect to the background stars. 3) All planets change the speed of their motion with respect to background stars. Outer planets slow down, stop, and move _______________(which direction?)_ periodically in retrograde loops. 4) ______________________(which planets?) __ are always found close to the sun. 5) ____________________(what ‘motion’?)_ is undetectable. _...
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- Fall '10
- Astronomy, Planet, Babylonian astronomy, Basic Observations