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ppk ppk
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13 years ago
Explain how the Doppler Effect has been used to detect invisible planets orbiting other Sun-like stars. 
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how_mendelhow_mendel
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13 years ago
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Biology!

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ppk Author
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13 years ago
Just got PERFECT on my quiz
logbi
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Yesterday
This calls for a celebration Person Raising Both Hands in Celebration
sadiewolf
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2 hours ago
Good timing, thanks!
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