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Simple chalk-style diagram showing a person standing on Earth, surrounded by stars and arrows pointing outward, illustrating why the night sky appears dark.

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Becklin-Neugebauer object 1983TB Universe Star Galaxy Solar system Star cluster Cosmic microwave background Quasar Planet X-ray source Constellation Black hole

Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.

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