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        Part of To Catch a Comet
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        Re-Creating the Comet | To Catch a Comet

        At NASA's Jet Propulsion Laboratory, Dr. Claudia Alexander, NASA's Rosetta Project Scientist, demonstrates how comets behave as they get closer within their orbits to the Sun. The Sun increases the temperature of a comet, resulting in ice sublimation. Sublimation occurs when a solid heats up and bypasses the liquid phase and becomes a gas. As the ices sublimate, they spew out gasses and dust into space. On a comet, this process accounts for the coma or halo which we observe as it barrels towards the Sun and becomes active.

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