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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
... > 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
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
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
... > 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 -
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 -
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 -
Charon (moon)
Charon, discovered in 1978, is, depending on the definition employed, either the largest moon of Pluto or one member of a double dwarf planet with Pluto being the other member. With the discovery in ... > more -
Definition of planet
The definition of "planet" has for some time been the subject of intense debate. Although the word dates back thousands of years, no officially decreed scientific definition of "planet" existed ... > more -
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 ... > more
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