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Uranus and its six largest moons compared at their proper relative sizes and relative positions
Uranus and its six largest moons compared at their proper relative sizes and relative positions

Uranus, the seventh planet of the Solar System, has 27 known moons, most of which are named after characters that appear in, or are mentioned in, the works of William Shakespeare and Alexander Pope. Uranus's moons are divided into three groups: thirteen inner moons, five major moons, and nine irregular moons. The inner and major moons all have prograde orbits, while orbits of the irregulars are mostly retrograde. The inner moons are small dark bodies that share common properties and origins with Uranus's rings. The five major moons are ellipsoidal, indicating that they reached hydrostatic equilibrium at some point in their past (and may still be in equilibrium), and four of them show signs of internally driven processes such as canyon formation and volcanism on their surfaces. William Herschel discovered the first two moons, Titania and Oberon, in 1787. The other three ellipsoidal moons were discovered in 1851 by William Lassell (Ariel and Umbriel) and in 1948 by Gerard Kuiper (Miranda). (Full list...)

Today's featured picture

Supreme Court of the United Kingdom

The Supreme Court of the United Kingdom is the final court of appeal in the United Kingdom for all civil cases, as well as for criminal cases originating in England, Wales and Northern Ireland. It also hears cases of the greatest public or constitutional importance affecting the whole population. The court is located in the Middlesex Guildhall on Parliament Square, London; this photograph depicts the interior of Court 1, the largest of the three courtrooms in the building.

Photograph credit: David Iliff

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