열람 Ceres
Ceres (pronounced /ˈsɪəriːz/,[15][16] or as Latin: Cerēs), formal designation 1 Ceres, is the smallest identified dwarf planet in the Solar System and the only one in the asteroid belt. It was discovered on January 1, 1801, by Giuseppe Piazzi,[17] and is named after the Roman goddess Ceres — the goddess of growing plants, the harvest, and motherly love.
With a diameter of about 950 km, Ceres is by far the largest and most massive body in the asteroid belt, and contains a third (32%) of the belt’s total mass.[18][19] Recent observations have revealed that it is spherical, unlike the irregular shapes of smaller bodies with lower gravity.[9] The surface of Ceres is probably made of a mixture of water ice and various hydrated minerals like carbonates and clays.[10] Ceres appears to be differentiated into a rocky core and ice mantle.[4] It may harbour an ocean of liquid water underneath its surface, which makes it a potential target in the search for extraterrestrial life.[19]
Ceres’ apparent magnitude ranges from 6.7 to 9.3, and hence at its brightest is still too dim to be seen with the naked eye.[11] On September 27, 2007, NASA launched the Dawn space probe to explore Vesta (2011–2012) and Ceres (2015).[20]