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Great Red Spot
The Great Red Spot is a
persistent anticyclonic
storm on the planet Jupiter,
22 degrees south of the
equator, which has lasted at
least 340 years. The storm
is large enough to be
visible through Earth-based
... > full story
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 ... > full story
Jupiter
Jupiter is the fifth planet
from the Sun and by far the
largest within the solar
system. Jupiter is usually
the fourth brightest object
in the sky (after the Sun,
the Moon and Venus); however
at times Mars appears
... > 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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Comet Shoemaker-Levy 9
Comet Shoemaker-Levy 9 (SL9, formally designated D/1993 F2) was a comet which collided with Jupiter in 1994, providing the first direct observation of the collision of two solar system ... > 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 -
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 -
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 -
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 -
Brown dwarf
Brown dwarfs were originally called black dwarfs, a classification for dark substellar objects floating freely in space which were too low in mass to sustain stable hydrogen ... > 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
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