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ppk ppk
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Posts: 3560
12 years ago
Explain what a standard candle is and how it could be used to determine a galaxy's distance. 
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sarah!sarah!
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Posts: 539
12 years ago
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ppk Author
wrote...

12 years ago
Thank you, thank you, thank you!
yen
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Yesterday
Smart ... Thanks!
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2 hours ago
Thanks
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