Neptune: Facts about the eighth planet from the sun
Because of the high temperatures and pressures that exist on Neptune and Uranus, scientists believe compressed carbon in the form of diamonds causes a"diamond rain" phenomenon on these icy giants. In 2017, researchers were able to simulate the conditions that would cause diamonds to form in the lab, supporting the hypothesis thatNeptune is surrounded by unusual rings, which aren't uniform, but possess bright thick clumps of dust called arcs.
By studying the cloud formations on the gas giant, scientists were able to calculate that a day on Neptune lasts just under. Neptune's elliptical, oval-shaped orbit keeps the planet an average distance from the sun of almost 2.8 billion miles , or roughly 30 times as far away as Earth, making it invisible to the naked eye. Neptune goes around the sun once roughly every 165 Earth years, and completed its first orbit since being discovered in 2011.
Every 248 years, Pluto moves inside Neptune's orbit for 20 years or so, during which time it is closer to the sun than Neptune. Nevertheless, Neptune remains the farthest planet from the sun, since Pluto was reclassified as a dwarf planet in 2006.
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