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By distance, Hydra is the fifth and outermost moon of Pluto, orbiting beyond Pluto's fourth moon Kerberos. [11] Hydra has a highly reflective surface caused by the presence of water ice, similar to other Plutonian moons. [15] Hydra's reflectivity is intermediate, in between those of Pluto and Charon. [16] The New Horizons spacecraft imaged ...
Moons of Pluto. The dwarf planet Pluto has five natural satellites. [ 1] In order of distance from Pluto, they are Charon, Styx, Nix, Kerberos, and Hydra. [ 2] Charon, the largest, is mutually tidally locked with Pluto, and is massive enough that Pluto and Charon are sometimes considered a binary dwarf planet.
Nix is a natural satellite of Pluto, with a diameter of 49.8 km (30.9 mi) across its longest dimension. [ 3] It was discovered along with Pluto's outermost moon Hydra on 15 May 2005 by astronomers using the Hubble Space Telescope, [ 1] and was named after Nyx, the Greek goddess of the night. [ 10] Nix is the third moon of Pluto by distance ...
Kerberos (moon) Kerberos is a small natural satellite of Pluto, about 19 km (12 mi) in its longest dimension. Kerberos is also the second-smallest moon of Pluto, after Styx. It was the fourth moon of Pluto to be discovered and its existence was announced on 20 July 2011. [1] It was imaged, along with Pluto and its four other moons, by the New ...
Pluto's origin and identity had long puzzled astronomers. One early hypothesis was that Pluto was an escaped moon of Neptune [161] knocked out of orbit by Neptune's largest moon, Triton. This idea was eventually rejected after dynamical studies showed it to be impossible because Pluto never approaches Neptune in its orbit.
Styx (moon) Styx is a small natural satellite of Pluto whose discovery was announced on 11 July 2012. It was discovered by use of the Hubble Space Telescope, and is the smallest of the five known moons of Pluto. It was imaged along with Pluto and Pluto's other moons by the New Horizons spacecraft in July 2015, albeit poorly with only a single ...
The Hydra dwells in an alternate dimension, and appears as a vast sea of gray ooze. A multitude of living heads, some human and some alien, sprout from the ooze, sobbing and grimacing as if in great agony. The Hydra's worshipers trick others into sending the god sacrifices through a pamphlet known as On the Sending Out of the Soul.
The use of astronomical symbols for the Sun and Moon dates to antiquity. The forms of the symbols that appear in the original papyrus texts of Greek horoscopes are a circle with one ray () for the Sun and a crescent for the Moon. [ 3] The modern Sun symbol, a circle with a dot (☉), first appeared in Europe in the Renaissance.