Seyfert galaxy: Quick Facts

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The small spiral galaxy NGC 7742, a Type 2 Seyfert galaxy, as seen by the Hubble Space Telescope.

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type 2 Seyfert galaxy type 1 Seyfert galaxy spiral galaxy Active galactic nucleus Quasar Milky Way Galaxy Galactic halo

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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