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Neptune's more varied weather when compared to Uranus is due in part to its higher internal heating. The upper regions of Neptune's troposphere reach a low temperature of 51.8 K (−221.3 °C). At a depth where the atmospheric pressure equals 1 bar (100 kPa), the temperature is 72.00 K (−201.15 °C). [128]
HD 69830 d is a Neptune-sized planet with a minimum mass of at least 12 ... In comparison, the Sun is 4.6 billion years old [4] and has a surface temperature of 5778 ...
A Mini-Neptune (sometimes known as a gas dwarf or transitional planet) is a planet less massive than Neptune but resembling Neptune in that it has a thick hydrogen-helium atmosphere, probably with deep layers of ice, rock or liquid oceans (made of water, ammonia, a mixture of both, or heavier volatiles).
The term gas giant was coined in 1952 by the science fiction writer James Blish [6] and was originally used to refer to all giant planets.It is, arguably, something of a misnomer because throughout most of the volume of all giant planets, the pressure is so high that matter is not in gaseous form. [7]
Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth and slightly larger than Neptune. [a] Neptune orbits the Sun once every 164.8 years at an average distance of 30.1 astronomical units (4.50 × 10 9 km).
HD 10180 f is a hot Neptune and similar in mass to HD 10180 e. At an orbital distance of 0.49 AU and eccentricity of 0.12, its orbit is analogous to that of Mercury with a similar black-body-temperature range, though with its high mass, any greenhouse effect caused by an atmosphere would give it searing Venus-like or greater temperatures.
Neptune's orbit is also nearly circular, with a low eccentricity of 0.0097; [15] as such, each season on Triton lasts roughly 40 years, and Triton's seasonal variations are almost entirely governed by the tilt of its rotational axis relative to the Sun. [16] [a] Triton is tidally locked, with one hemisphere facing Neptune at all times; Triton's ...
Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness. ... this implies that 0 K is the minimum possible temperature.