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Para otros usos de este término, véase Astronomía (desambiguación).


El Hubble: telescopio ubicado fuera de la atmósfera que observa objetos celestes. Sus maravillosas imágenes han asombrado al mundo. Es el icono de la astronomía moderna.
La astronomía (del latín astronomĭa, y este del griego ἀστρονομία)1 es la ciencia que se ocupa del estudiode los cuerpos celestes del universo, incluidos los planetas y sus satélites, los cometas y meteoroides, las estrellas y la materia interestelar, los sistemas de materia oscura, estrellas, gas y polvo llamados galaxias y los cúmulos de galaxias; por lo que estudia sus movimientos y los fenómenos ligados a ellos. Su registro y la investigación de su origen viene a partir de la información que llegade ellos a través de la radiación electromagnética o de cualquier otro medio. La astronomía ha estado ligada al ser humano desde la antigüedad y todas las civilizaciones han tenido contacto con esta ciencia. Personajes como Aristóteles, Tales de Mileto, Anaxágoras, Aristarco de Samos, Hiparco de Nicea, Claudio Ptolomeo, Hipatia de Alejandría, Nicolás Copérnico, Tycho Brahe, Johannes Kepler,...