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Saturn
Saturn is the sixth planet
from the Sun. It is a gas
giant, the second-largest
planet in the solar system
after Jupiter. Saturn has a
prominent system of rings,
consisting of mostly ice
particles with a smaller
... > full story
Titan (moon)
Titan, or Saturn VI, is the
largest moon of Saturn and
the second largest moon in
the solar system, after
Jupiter's moon Ganymede. It
is roughly 50% larger than
Earth's moon by diameter,
and is larger by diameter
... > full story
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
... > 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
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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 Lassell in ... > more -
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 -
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 -
Multistage rocket
A multistage (or multi-stage) rocket is, like any rocket, propelled by the recoil pressure of the burning gases it emits as it burns fuel. What characterizes it as "multi-stage" is that it ... > 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 -
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
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