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How can scientists distinguish between planetary nebulae and supernova remnants?

Robert Nichols, Moretown, Vermont
RELATED TOPICS: SUPERNOVA | NEBULAE
IC 4593
Distinguishing between a planetary nebula and a supernova remnant is not always straightforward because they often have similar shapes and sizes. However, the light that these two types of objects emit shows several differences, and we therefore often have to take a multiwavelength approach.

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