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April 1, 2024
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Grace
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Arno Penzias and Robert Wilson discover cosmic microwave background radiation, further evidence supporting the Big Bang model
Edwin Hubble discovers evidence of an expanding universe, which supports the Big Bang model.
Georges Lemaitre proposes the Big Bang theory, which suggest that the universe began as a giant explosion of energy.
Friedrich Bassel observes stellar parallax.
William Herschel constructs the first map of the Milky Way galaxy.
Thomas Wright suggest that the Milky Way galaxy is a flattened disk of stars and that nebulae might be other galaxies.
Isaac Newton publishes 'Principia Mathematica' in which, among other things, he explains the laws of gravity.
Kepler publishes 'Astronomia Nova', explaining the motion of the planets by using a heliocentric model of the universe and elliptical orbits.
Ferdinand Magellan is the first European to observe the Magellanic Clouds, which are later recognised as galaxies outside the Milky Way.
Aristotle describes the geocentric (earth-centred) model of the universe.
Aristarchus proposes a heliocentric (sun-centred) model of the universe that is widely ignored.
Ptolemy refines the geocentric model of the universe to try to explain the retrograde (east to west) motion of planets.
