A Habitable Sun

In his 1795 paper On the Nature and Construction of the Sun and Fixed Stars, Herschel proposed that the Sun consisted of a bright, hot luminous outer atmosphere surrounding a cooler, solid, and by his argument potentially habitable interior surface, reasoning by analogy from sunspots, which he interpreted as openings in the luminous layer revealing the darker body beneath. He extended the same reasoning to the fixed stars generally, arguing they were likely constructed the same way and that each might harbor its own inhabited interior world shielded from its own fierce exterior.

Herschel framed this argument explicitly within the tradition of cosmic pluralism, the natural theology position, already well established among his contemporaries, that a God of infinite power and goodness would fill the greatest possible number of worlds with life rather than concentrate creation narrowly on Earth, and that discovering more inhabited worlds honored rather than diminished divine glory. The proposal drew informed skepticism even in Herschel's own time and has no standing in modern astrophysics, which understands the Sun as a wholly gaseous body with no solid habitable interior; the atlas records it honestly as a documented historical argument from a serious scientist working explicitly within natural theology's framework, not as a claim with any modern scientific standing.