PEOPLE & INSTITUTIONS

Albert Einstein - Wikipedia, the free encyclopedia

American Astronomical Society - Wikipedia, the free encyclopedia

Tycho Brahe - Wikipedia, the free encyclopedia

categoryAstronomical observatories - Wikipedia, the free encyclopedia

categoryAstronomy institutes and departments - Wikipedia, the free encyclopedia

categoryAstronomy organizations - Wikipedia, the free encyclopedia

categoryPlanetaria - Wikipedia, the free encyclopedia

Nicolaus Copernicus - Wikipedia, the free encyclopedia

Johannes Kepler - Wikipedia, the free encyclopedia

Kepler orbit - Wikipedia, the free encyclopedia

Georges Lemaître - Wikipedia, the free encyclopedia

List of astronomers - Wikipedia, the free encyclopedia

List of astronomical societies - Wikipedia, the free encyclopedia

Newton's law of universal gravitation - Wikipedia, the free encyclopedia