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Dust grains injected into interstellar space from exploding stars and cool stellar envelopes – we call these grains stardust – don't last forever. In fact, dust grains have a rather eventful life, and eventually come to a bad end: they are destroyed. There are various interstellar processes that tend to demolish dust grains. Some of these processes – such as high-velocity shocks – destroy dust grains instantaneously and turn them back into their constituent atoms; some processes re-distribute matter and alter the grain size distribution, while others may change the physical properties of the dust material. If the dust is embedded in an interstellar gas cloud that collapses to form a new star, then that dust will be destroyed inside the star, once the star ‘switches on’, because of the very high temperatures in stellar interiors. In this chapter we discuss those processes that affect dust in the interstellar medium, after the dust is formed in stellar explosions and cool stellar envelopes.

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