Eventos
Aristotle describes the geocentric model of the universeAristarchus 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 the planets.Ferdinand Magellan is the first European to observe the Magellanic
clouds, which are later recognised as galaxies outside the Milky WayNicholas Copernicus publishes a paper that presents the heliocentric
model with a number of improvements on Aristarchus' version.Giordano Bruno is burnt at
the stake
for promoting a
heliocentric
model of the universe.Kepler publishes
Astronomia Nova, explaining
planetary motion
using a heliocentric
model of the universe
and 2 elliptical orbits.Galileo Galilei observes
the moons of Jupiter.Galileo publishes his Dialogue of Two World Systems
which argues in favour of the heliocentric universe model.Isaac Newton publishes Principia Mathematica which explains the law of gravity.Thomas Wright suggests the Milky Way is a flattened disc of stars.William Herschel discovers Uranus.Herschel constructs a map of the Milky WayJohn Couch Adams discovers Neptune.Friedrich Bassel observes a star parallax - movement of stars apparent to Earth's position.Ernst Opik
shows the
Andromeda galaxy
is outside
the Milky WayGeorge Lemaitre
proposes the Big
Bang theoryEdwin Hubble discovers
an expanding universe.Clyde Tombaugh discovers PlutoArno Penzias and Robert
Wilson discover cosmic microwave radiationNeil Armstrong and Buzz
Aldrin are the first people
to walk on the Moon.Pioneer 10 leaves the solar system.The spacecraft
Galileo finds ice on
Europa.Planet-sized objects are
discovered in the Kuiper Belt.The Astronomical
Union decide Pluto
is not a planet.Astronomers saw the first glimpse of a black hole.Astronomers find gravitational waves
for the first time in history.
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