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Transformation and Evolution of a Long-Period Comet

Description
Transformation and Evolution of a Long-Period Comet
(a) The gravitational force of a giant planet can change a comet’s
orbit. Comets initially on highly elliptical orbits are sometimes
deflected into more circular paths that keep them in the inner
solar system. (b–d) These figures show the evolution of a comet
into gas, dust, and rubble, and why debris from some of these
comets strikes Earth
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