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        Part of To Catch a Comet
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        How Comets Become Active | To Catch a Comet: Chapter 4

        Understand the importance of gaining key information about the target comet before Rosetta enters orbit around it. After we learn that the comet has become active earlier than expected, Dr. Claudia Alexander demonstrates in a laboratory how and why a comet develops its coma. We follow the flight team as they perform the first Big Burn which propels Rosetta into the comet's path.

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