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Keplar publishes first two laws of planetary motion
Law 1: The orbit of every planet is an ellipse with two foci.
Law 2: A line joining a planet and the Sun sweeps out equal areas during equal intervals of time -
Jupiter is discovered by Galileo
Jupiter is the largest planet in our solar system. It is one-tenth the size of the sun and ten times the size of the earth. -
Galileo discovers inertia
Inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line. It is one of the properties that keep the planets in their orbits. -
Callisto discovered by Marius
Jupiter's moon, Callisto, was discovered by Galileo and Marius. -
First telescope turned to space by Galileo
In 1610, Galileo first turned a telescope to space, starting the scientific interest of space. -
Io discovered by Galileo
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Europa discovered by Galileo
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Ganymede discovered by Galileo
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Keplar publishes third law of planetary motion
Law 3: The square of the orbital period is directly proportional to the cube of the semi-major axis of its orbit. -
Gravity discovered
Gravity was discovered by Sir Isaac Newton. Gravity is a key force that keeps the planets in orbit. While the Earth would "like" to move in a straight line, the sun's gravitational pull keeps the Panets in orbit. -
Titan discovered by Huygens
Titan is the fifteenth and largest of Saturn's satellites. -
Iapetus dicovered by Cassini
Iapetus is the seventeenth and third largest of Saturn's moons. -
Rhea dicovered by Cassini
Rhea is the fourteenth and second largest of Saturn's moons -
Dione discovered by Cassini
Dione is Saturn's twelfth satellite. -
Tethys discovered by Cassini
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Uranus discovered by Herschel
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Titania discovered by Herschel
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Oberon discovered by Herscel
Oberon is the outermost of Uranu's moons. -
Enceladus discovered by Herchel
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Mimas discovered by Herschel
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Triton by Lassell
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Neptune discovered
Neptune was the first planet to be discovered using math. It is the furthest planet from the sun. -
Hyperion discovered by Bond
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Ariel discovered by Lassell
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Umbriel discovered by Lassell
Umbrial is the thirteenth of Uranus's known moons. -
Phobos discovered by Hall
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Deimos discovered
The second and smallest Mars moon discovered by Hall. -
Amalthea discovered
The fifth of Jupiter's moons discovered by Barnard. -
Phoebe discovered
The outermost of Saturn's satellites discovered by Pickering. -
Himalia discovered
Jupiter's tenth satellite discovered by Perrine. -
Himalia discovered by Perrine
Jupiter's tenth moon. -
Elara discovered by Perrine
Elara is Jupiter's twelfth satellite. -
Pasiphae discovered
Pasiphae, the fifteenth of Jupiter's known satellites, discovered by P. Melotte in 1908 -
Sinope discovered by Nicholson
Sinope is the furthest satellite from Jupiter. -
Pluto discovered by Tombaugh
Pluto was discovered by a complete accident. It was found while Clyde W. Tombaugh was searching the sky for Planet X. Instead of being called a planet, Pluto is considered to be a dwarf planet because of its size. Pluto has three moons, Charon, Hydra, and Nix. Pluto differs from the other planets by having the most irregular orbit. In some pionts in its orbit, Pluto is closer to the sun than Neptune. Its orbit is the furthest from circular. -
Carme discovered by Nicholson
Carme is Jupiter's fourteenth satellite. -
Lysithea discovered by Nicholson
Lysithea is the 11th of Jupiter's moons -
Miranda discovered.
Miranda, the eleventh of Uranus's known satellites, was discovered by Kuiper. Miranda is the closest moon to Uranus. -
Nereid discovered Kuiper
Nereid is the furthest moon from Neptune. -
Ananke discovered by Nicholson
Ananke is Jupiter's 13th satellite. -
Epimetheus discovered by Walker
Epimetheus is the fifth moon of Saturn. It is co-orbital. -
Janus discovered by Audouin Dollfus
Janus is the sixth satellite of Saturn. -
Leda discovered by Kowal
The smallest of Jupiter's moons. -
Charon discovered by Jim Christy
Pluto's largest moon. -
Thebe discovered by Synnott
Jupiter's 4th satellite. -
Adrastea discovered David Jewitt
Jupiters second moon. -
Metis discovered by Synnott
Jupiters innermost moon. -
Prometheus discovered by S. Collins
Prometheus is the third of Saturn's moons. -
Atlas discovered by R. Terrile
Atlas is the second of Saturn's small moons. -
Telestro discovered by Smith, Reitsema, Larson and Fountain
Telestro is the tenth of Saturn's known satellites -
Pandora discovered by Collins
Pandora is Saturn's fourth moon. -
Calypso discovered by Pascu, Seidelmann, Baum and Currie
Calypso is the is the eleventh of Saturn's known satellites -
Helene discovered by Laques and Lecacheux
Helene is the thirteenth of Saturn's known moons. -
Puck discovered by the Voyager 2
Puck is the tenth of Uranus's moons -
Belinda, Bianca, Cordelia, Cressida, Desdemona, Juliet, Ophelia, Portia, and Rosalind discovered by the Voyager 2
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Despina, Galatea, Naiad, Proteus , and Thalassa dicovered by the Voyager 2
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Pan discovered by Showalter
Pan is the closest moon to Saturn.
