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The images relayed back to Earth from Voyager 2 became the basis of a 1989 PBS all-night program, Neptune All Night. [191] During the encounter, signals from the spacecraft required 246 minutes to reach Earth. Hence, for the most part, Voyager 2 's mission relied on preloaded commands for the Neptune encounter.
The Pluto–Charon barycenter came to perihelion on September 5, 1989, [4] [l] and was last closer to the Sun than Neptune between February 7, 1979, and February 11, 1999. [87] Although the 3:2 resonance with Neptune (see below) is maintained, Pluto's inclination and eccentricity behave in a chaotic manner.
Most auroras occur in a band known as the "auroral zone", [8] which is typically 3° to 6° (approximately 330–660 km) wide in latitude and between 10° and 20° from the geomagnetic poles at all local times (or longitudes), most clearly seen at night against a dark sky. A region that currently displays an aurora is called the "auroral oval ...
A diagram of a typical nautical sextant, a tool used in celestial navigation to measure the angle between two objects viewed by means of its optical sight. Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the ...
Extraterrestrial atmosphere. Major features of the Solar System (not to scale) Graphs of escape velocity against surface temperature of some Solar System objects showing which gases are retained. The objects are drawn to scale, and their data points are at the black dots in the middle. The study of extraterrestrial atmospheres is an active ...
Neptune (Latin: Neptūnus [nɛpˈtuːnʊs]) is the god of freshwater and the sea in the Roman religion. [2] He is the counterpart of the Greek god Poseidon. [3] In the Greek-inspired tradition, he is a brother of Jupiter and Pluto, with whom preside over the realms of heaven, the earthly world (including the underworld), and the seas. [4]
Triton dominates the Neptunian moon system, with over 99.5% of its total mass. This imbalance may reflect the elimination of many of Neptune's original satellites following Triton's capture. [4][5] Triton (lower left) compared to the Moon (upper left) and Earth (right), to scale. Triton is the seventh-largest moon and sixteenth-largest object ...
At that time, Uranus, Neptune, nor the asteroid belts had been discovered yet. Discovery and exploration of the Solar System is observation, visitation, and increase in knowledge and understanding of Earth 's "cosmic neighborhood". [1] This includes the Sun, Earth and the Moon, the major planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus ...