And described a lens-shaped island universe of which the density decreased away from the center, now known as the Kapteyn Universe
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And described a lens-shaped island universe of which the density decreased away from the center, now known as the Kapteyn Universe
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-18 from Wikipedia. The archived copy is preserved so this citation survives link rot.