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260 BCE
Greek astronomer
Aratos discovers the
Beehive Cluster.
130 Claudius
Ptolemy discovers the star cluster now known as
Ptolemy's Cluster.
964 Persian
astronomer Abd Al-Rahman Al Suffi discovers the
Andromeda Galaxy.
1610 Galileo
Galilei discovers four moons orbiting the planet
Jupiter:
Io,
Europa,
Ganymede, and
Callisto.
1610 Nicholas-Claude
Fabri de Peiresc discovers the
Orion Nebula.
1610 Galileo
Galilei discovers
rings of the planet
Saturn.
1654 Giovanni
Battista discovers the
Triangulum Galaxy
and the Butterfly Cluster.
1665 Giovanni
Cassini discovers the Great Red Spot on
Jupiter.
1714 English
astronomer Edmund Halley
discovers the Hercules
Cluster.
1731 Astronomer
John Bevis discovers the
Crab Nebula.
1745 Swiss
astronomer Philippe Loys de Chéseaux discovers several notable
nebulae including: the
Eagle Nebula, the Swan Nebula, the
Omega Nebula and the
Lobster Nebula.
1751 French
astronomer Nicholas Louis de la Caille discovers the
Southern
Pinwheel Galaxy.
1764 Charles
Messier discovers the
Dumbbell Nebula.
1773 Charles
Messier discovers the
Whirlpool Galaxy.
1774 Johann
Elert Bode discovers
the
Cigar Galaxy and a
galaxy which would later be named in his honor,
Bode's Galaxy.
1779 Astronomer
Pierre Mechain discovers the
Sunflower Galaxy
and the Black Eye
Galaxy.
1779 French
Astronomer Antoine Darquier de Pellepoix discovers the
Ring Nebula.
1781 William
Herschel discovers the planet Uranus while measuring the
brightness and direction of stars.
1781 Pierre
Mechain discovers three notable galaxies: the
Pinwheel Galaxy,
the Spindle Galaxy,
and the Sombrero
Galaxy.
1781 Charles
Messier discovers the galaxy
Virgo A.
1781 Pierre
Mechain discovers the Owl
Nebula.
1801 Giuseppe
Piazzi discovers Ceres, the first known asteroid.
1877 American
astronomer Asaph Hall discovers Mars' two moons:
Deimos and
Phobos.
1930 Astronomer
Clyde Tombaugh discovers the dwarf planet Pluto.
1978 Astronomer
James Christy discovers Charon,
the only known moon orbiting Pluto.
1986 The
Voyager 2 spacecraft discovers nine moons orbiting the planet
Uranus.
1989 The
Voyager 2 spacecraft discovers four moons orbiting the planet
Neptune.
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