![]() Download Download Download Download Download Poster - Multicolor 2. The symbol for dwarf planet Pluto is a monogram made up of P and L in Pluto (and also the initials of Percival Lowell, who predicted its discovery). The largest, Triton, is geologically active, with geysers of liquid nitrogen. The symbol for Neptune is the trident (long three-pronged fork or weapon) of Neptune, god of the sea. At its furthest distance from the Sun (aphelion) it is 30.32 AU from the Sun. ![]() At is closest approach to the Sun (perihelion) it is nearly 30 times the distance of the Earth from the Sun (29.80 AU). Neptune has an orbital period (sidereal year) of 164.79 earth years. The variation in polar tilts and increased temperature may be a contributing factor to the winds on Neptune which reach velocities of about 2,000 k/h (1,240 m/h) Orbital characteristics The northern hemisphere summers and winters lasts approximately 40 years each. Neptune’s polar orientation is similar to Earth’s with the northern pole tilting toward or away from the Sun in season. Orbiting the Sun at a distance of 4.5 billion kilometres - more than 30 times further out than the Earth - Neptune is a dark, icy world. However, its methane component reaches the upper atmosphere absorbing red light from sunlight and reflects the blue spectrum making Neptune appear blue. They travel around our Sun in a flattened circle called an ellipse. Neptune is comprised predominantly of hydrogen and helium. Planets, asteroids, and comets orbit our Sun. ![]() This results in the vaporisation of the frozen methane and its circulation to the upper layers of the atmosphere. Recent measurements have shown the southern pole to be about 10° C hotter than the planet's average. The average temperature on Neptune is -200° C (-392° F). ESO Very Large Telescope thermal images of Neptune's south polar region showing variation in temperature.
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