Category

Discoveries by William Herschel

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Uranus is the seventh planet from the Sun. It is a gaseous cyan-coloured ice giant. Most of the planet is made of water, ammonia, and methane in a supercritical phase of matter, which astronomy calls "ice" or volatiles. The planet's atmosphere has a complex layered cloud structure and has the lowest minimum temperature () of all the Solar System's planets. It has a marked axial tilt of 82.23° with a retrograde rotation period of 17 hours and 14 minutes. This means that in an 84-Earth-year orbital period around the Sun, its poles get around 42 years of continuous sunlight, followed by 42 years

Enceladus is the sixth-largest moon of Saturn and the 18th largest in the Solar System. It is about in diameter, about a tenth of that of Saturn's largest moon, Titan. It is covered by clean, freshly deposited snow hundreds of meters thick, making it one of the most reflective bodies of the Solar System. Consequently, its surface temperature at noon reaches only , far colder than a light-absorbing body would be. Despite its small size, Enceladus has a wide variety of surface features, ranging from old, heavily cratered regions to young, tectonically deformed terrain.

largest moon of Uranus

Mimas is the seventh-largest natural satellite of Saturn. With a mean diameter of , Mimas is the smallest astronomical body known to be roughly rounded in shape due to its own gravity. Mimas's low density, 1.15 g/cm3, indicates that it is composed mostly of water ice with only a small amount of rock, and study of Mimas's motion suggests that it may have a liquid ocean beneath its surface ice. The surface of Mimas is heavily cratered and shows little signs of recent geological activity. A notable feature of Mimas's surface is Herschel, one of the largest craters relative to the size of the

Cat's Eye Nebula

planetary nebula in the constellation Draco

spiral galaxy in the constellation Coma Berenices

spiral galaxy in the constellation Camelopardalis

spiral galaxy in the constellation Andromeda

spiral galaxy in the constellation Sculptor

planetary nebula in the constellation Cepheus

spiral galaxy in the constellation Pegasus

elliptical galaxy in the constellation Pisces

spiral galaxy in the constellation Andromeda

pair of colliding spiral galaxies in the constellation Pisces

spiral galaxy in constellation Pegasus

H II region inside the Triangulum Galaxy

planetary nebula in the constellation Cetus

open star cluster in the constellation Cassiopeia

elliptical galaxy in the constellation Coma Berenices

spiral galaxy in the constellation Coma Berenices

seyfert galaxy in the constellation Perseus

supergiant lenticular galaxy in the constellation Virgo

spiral galaxy in the constellation Canes Venatici

galaxy in the constellation Ursa Major

spiral galaxy in the constellation Cancer

Irregular galaxy in the constellation Canes Venatici

spiral galaxy in the constellation Ursa Major

barred spiral galaxy

spiral galaxy in the constellation Ursa Major

lenticular galaxy in the constellation Andromeda

lenticular galaxy in the constellation Andromeda

spiral galaxy in the constellation Ursa Major

spiral galaxy in the constellation Pisces

spiral galaxy in the constellation Antlia

ring galaxy in the constellation Pegasus

spiral galaxy in the constellation Cetus

lenticular galaxy in the constellation Virgo

spiral galaxy in the constellation Canes Venatici

barred spiral galaxy in the constellation Ursa Major

spiral galaxy in the constellation Cetus

spiral galaxy in the constellation Coma Berenicies

galaxy in the M83 group of galaxies

open cluster of the constellation Cassiopeia

spiral galaxy in the constellation Leo

spiral galaxy in the constellation Ursa Major