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| Particles and Waves |

This is the central portion of the Eagle Nebula (located about 7000 light-years from the earth), as seen by the Hubble Space Telescope. Among the topics in this chapter are particle-like entities called photons. As we will see, they play the central role in the process of photo-evaporation, which allows astronomers to peer into the dense star-forming regions of the nebula. (Courtesy NASA)

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