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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
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
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
... > full story
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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 -
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 -
Transit of Venus
A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and the Earth, obscuring a small portion of the Sun's ... > more -
Phobos (moon)
Phobos is the larger and innermost of Mars' two moons, and is named after Phobos, son of Ares (Mars) from Greek Mythology. Phobos orbits closer to a major planet than any other moon in the solar ... > 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 -
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 -
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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