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How Did Galaxies Form?

The key question is: Did galaxies, stars, or black holes come first?
RELATED TOPICS: GREATEST MYSTERIES | GALAXIES
WheelInSky
WHEEL IN THE SKY. Hoag’s Object is a ring of hot blue stars wheeling around a cooler yellow nucleus. The whole galaxy measures about 120,000 light-years across, slightly larger than the Milky Way.
NASA/The Hubble Heritage Team

While observational tests on the details of cosmology proceed apace, astronomers are focusing on the mechanics of how matter came together in the early universe. The key question is: Did galaxies, stars, or black holes come first?

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