Timeline of cosmologyTimeline of cosmology 1576 Thomas Digges modifies the Copernican system by removing its outer edge and replacing the edge with a star-filled unbounded space 1610 Johannes Kepler uses the dark night sky to argue for a finite universe 1720 Edmund Halley put
Timeline of planetary explorationTimeline of planetary exploration by date of launch. Already-launched missions in italic have not yet achieved success or failure. 1950s 1957 Sputnik 1 4 October 1957 1st Earth Orbiter Sputnik 2 3 November 1957 Earth Orbiter Vanguard TV3 6 December 1957 A
Timeline of solar astronomyTimeline of solar astronomy 1613 Galileo Galilei uses sunspot observations to demonstrate the rotation of the Sun 1619 Johannes Kepler postulates a solar wind to explain the direction of comet tails 1802 William Hyde Wollaston observes dark lines in the s
Timeline of solar system astronomyTimeline of solar system astronomy 2137 BC, October 22 Chinese astronomers record a solar eclipse 586 BC Thales of Miletus predicts a solar eclipse 350 BC Aristotle argues for a spherical Earth using lunar eclipses and other observations 280 BC Aristarchu
Timeline of stellar astronomyTimeline of stellar astronomy 134 BC Hipparchus creates the magnitude scale of stellar apparent luminosities 1596 David Fabricius notices that Mira's brightness varies 1672 Geminiano Montanari notices that Algol's brightness varies 1686 Gottfried Kirch no
Timeline of telescopes, observatories, and observing technologyTimeline of telescopes, observatories, and observing technology. Timeline Before Christ era 1800 BC Babylonian star catalog 3100-1700 BC Stonehenge 432 BC Athens observatory on Lycabettus Hill used by Meton and Phaeinus 350s BC Eudoxus of Cnidos observato
Timeline of the Big BangOverview According to the Big Bang theory, a sequence of events described below is believed to have taken place starting 13. 2 billion years ago, a time at which in general relativity there is a gravitational singularity. General relativity cannot describ