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Loading contentTwo very different deep-sky objects often confused with one another.
A gravitationally bound system of stars, gas, dust, and dark matter.
An interstellar cloud of gas and dust.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
European missions, observatories, and space science imagery.