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| associated links |
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| a s t r o n o m y w i t h t r u |
| credits: www.space.com |
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| Dark Energy: Astronomers Hot on Trail of Mysterious Force |
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| a s t r o n o m y w i t h t r u |
| a s t r o n o m y w i t h t r u |
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| History of expansion: A rough picture of how the universe's expansion decelerated, then began to accelerate. Fate is not known. |