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ppk ppk
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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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12 years ago
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ppk Author
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12 years ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
Natalie Price
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Yesterday
You make an excellent tutor!
noodlelicker
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2 hours ago
Thank you, thank you, thank you!
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