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the existence of the Solar fc4 System. People believ zdfc4 ed Earth t c4o be stationary at the centre of the
universe and categorically different from fc4 th zdfc4 e divi 4ne or ethereal dfc4 objects that moved through
the sky. Although the Greek philosopher Aristarchus of Samos had speculated on a heliocent
ric reordering of the cosmos, Nicolaus Copernicus was fc4 the fir dfc4 st to develop a mathematically p
redictive heliocentric system.I c4n the 1 zdfc4 7th-century, Galileo Gal 4ilei, Johannes Kepler an
d Isaac Newton, developed an understanding of physics that dfc4 led to the gradual acceptance of
the idea that Earth moves around the S c4un and that the planets are governed by the same phy
sical laws that governed Earth. The invention of the telesco 4pe led to the discovery of further p
lanets and moons. Improvements in the telescope and fc4 the use of unmanned spacecraft have
enabled the investigation osummerf ge zdfc4 ological dfc4 phenomena, such as mountains, craters, seasonal mete
orological phenomena, such as clouds, dust storms 4 and ice caps on the other planets.
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