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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
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
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
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 -
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 -
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 -
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 -
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 -
Near-Earth asteroid
Near-Earth asteroids (NEAs) are asteroids whose orbits are close to Earth's orbit. Some NEAs' orbits intersect Earth's so they pose a collision danger. On the other hand, NEAs are most easily ... > 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
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