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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 of the four
... > full story
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
... > full story
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 2005 of two
... > full story
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 before the
... > full story
Browse Reference Articles
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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 -
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 the second, Nereid. ... > more -
Ceres (dwarf planet)
Ceres, also designated 1 Ceres or (1) Ceres, is the smallest dwarf planet in the Solar System and the only one located in the main asteroid belt. With a diameter of about 950 km, Ceres is by far the ... > 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 -
Equatorial bulge
An equatorial bulge is a planetological term which describes a bulge which a planet may have around its equator, distorting it into an oblate spheroid. Because of a planet's equatorial bulge, its ... > more -
Solar System
The Solar System consists of the Sun and the other celestial objects gravitationally bound to it: the eight planets, their 165 known moons, three dwarf planets (Ceres, Pluto, and Eris and their four ... > 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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