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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
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 of the four
... > full story
Neptune
Neptune is the eighth and
outermost planet in our
solar system. It is the
fourth-largest planet by
diameter and the
third-largest by mass;
Neptune is 17 times the mass
of Earth and is slightly
... > full story
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
Browse Reference Articles
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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 -
Eris (dwarf planet)
Eris is the largest known dwarf planet in the solar system. It is a trans-Neptunian object (TNO), orbiting the Sun in a region of space known as the scattered disc, just beyond the Kuiper belt, and ... > 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 -
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 -
Saturn's natural satellites
Saturn is currently known to have 56 moons, many of which were discovered very recently, and 3 additional un-confirmed, hypothetical moons. However, a precise number of moons can never be given, as ... > more
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