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Danish astronomer whose observations of the planets provided the basis for Kepler's laws of planetary motion (1546-1601) Brahe , Tycho Brahe
any star in the Ptolemaic theory of planetary motion fixed star
(spaceflight) a trajectory that passes close to a planetary body in order to gain energy from its gravitational field gravity-assist
earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life Hadean , Hadean aeon , Hadean eon , Hadean time , Priscoan , Priscoan aeon , Priscoan eon
English scientist who formulated the law of elasticity and proposed a wave theory of light and formulated a theory of planetary motion and proposed the inverse square law of gravitational attraction and discovered the cellular structure of cork and introd Hooke , Robert Hooke
German astronomer who first stated laws of planetary motion (1571-1630) Johan Kepler , Johannes Kepler , Kepler
(astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler Kepler's law , Kepler's law of planetary motion
planetary satellite moon
any star around which a planetary system evolves sun
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