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Great Red Spot
The Great Red Spot is a
persistent anticyclonic
storm on the planet Jupiter,
22 degrees south of the
equator, which has lasted at
least 340 years. The storm
is large enough to be
visible through Earth-based
... > full story
Gas giant
A gas giant is a large
planet that is not primarily
composed of rock or other
solid matter. Gas giants may
have a rocky or metallic
core—in fact, such a
core is thought to be
required for a gas giant to
... > full story
Jupiter's natural satellites
Jupiter has 63 known natural
satellites. Although claims
are made for the observation
of one of Jupiter's moons by
Chinese astronomer Gan De in
364 BC, the first certain
observations of Jupiter's ... > full story
Neptune's natural satellites
Neptune has 13 known moons.
The largest by far is
Triton, discovered by
William Lassell just 17 days
after the discovery of
Neptune itself. It took a
hundred years to discover
... > full story
Browse Reference Articles
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Dysnomia (moon)
Dysnomia, is a moon of the dwarf planet Eris. The satellite is about 60 times fainter than Eris, and its diameter is estimated to be approximately eight times smaller. Astronomers now know that three ... > more -
Asteroid belt
The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. Despite popular imagery, the ... > more -
Comet Shoemaker-Levy 9
Comet Shoemaker-Levy 9 (SL9, formally designated D/1993 F2) was a comet which collided with Jupiter in 1994, providing the first direct observation of the collision of two solar system ... > more -
Uranus' natural satellites
Uranus has 27 known moons. The first two moons (Titania and Oberon) were discovered by William Herschel on March 13, 1787. Two more moons (Ariel and Umbriel) were discovered by William Lassell in ... > more -
Brown dwarf
Brown dwarfs were originally called black dwarfs, a classification for dark substellar objects floating freely in space which were too low in mass to sustain stable hydrogen ... > more -
Deimos (moon)
Deimos is probably an asteroid that was perturbed by Jupiter into an orbit that allowed it to be captured by Mars, though this hypothesis is still in some dispute. Like most bodies of its size, ... > more -
Impact crater
An impact crater is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the ... > more -
Voyager program
The Voyager program consisted of a pair of unmanned scientific probes, Voyager 1 and Voyager 2, launched in 1977. They were sent to study Jupiter and Saturn, using an advantageous planetary alignment ... > more
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