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ppk ppk
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12 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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12 years ago
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Biology!

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ppk Author
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12 years ago
Thanks for your help!!
7.prime7105
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Yesterday
Good timing, thanks!
Turboturner
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2 hours ago
You make an excellent tutor!
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