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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 disc. ... > full story
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, Deimos
... > 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
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
Browse Reference Articles
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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 ... > 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 -
Mercury (planet)
Mercury is the innermost and smallest planet in the solar system, orbiting the Sun once every 88 days. It ranges in brightness from about −2.0 to 5.5 in apparent magnitude, but is not easily ... > more -
Alpha Centauri
Alpha Centauri (α Cen / α Centauri) is the brightest star system (a triple star system) in the southern constellation of Centaurus, and contains the fourth brightest star in the night ... > 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 -
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 -
Precession
Precession refers to a change in the direction of the axis of a rotating object. In certain contexts, "precession" may refer to the precession that the Earth experiences, the effects of this type of ... > more
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