Herschel believed the Milky Way was a disk of stars, while Shapley found the extended halo more like a ball.

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Herschel's early observations led him to conclude that the Milky Way was a disk-shaped collection of stars, while later, Harlow Shapley's work on globular clusters revealed the existence of an extended halo around the Milky Way, suggesting a more spherical distribution of stars beyond the disk.

Herschel Believed the Milky Way Was a Disk of Stars