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The methane abundance relative to molecular hydrogen in the stratosphere is about 10 −4, [16] while the abundance ratio of other light hydrocarbons, like ethane and acetylene, to molecular hydrogen is about 10 −6. [16] Jupiter's thermosphere is located at pressures lower than 1 μbar and demonstrates such phenomena as airglow, polar aurorae ...
The term "hycean planet" was coined in 2021 by a team of exoplanet researchers at the University of Cambridge, as a portmanteau of "hydrogen" and "ocean," used to describe planets that are thought to have large oceans and hydrogen-rich atmospheres.
Jupiter's helium abundance is 80% of the Sun's, similar to Saturn's composition. The ongoing contraction of Jupiter's interior generates more heat than the planet receives from the Sun. Its internal structure is believed to consist of an outer mantle of fluid metallic hydrogen and a diffuse inner core of denser material.
NASA's Juno spacecraft captured this view of Jupiter during the mission's 54th close flyby of the giant planet Sept. 7, 2023.
Jupiter, too, has trace amounts of hydrogen sulfide in its atmosphere. This planet is about 10% larger than Jupiter in diameter and mass. In addition to detecting hydrogen sulfide, a sulfur ...
There are many theories about oceans or even ocean worlds of celestial bodies in the Solar System, from oceans made of liquid carbon with floating diamonds in Neptune to a gigantic ocean of liquid hydrogen that may exist underneath Jupiter's surface. [4] Early in their geologic histories, Mars and Venus are theorized to have had large water oceans.
The Jupiter Icy Moons Explorer (JUICE) is set to take off today (14 April) after it was delayed yesterday (13 April) due to lightning warnings. Led by the European Space Agency, the mission will ...
A cold hydrogen-rich gas giant more massive than Jupiter but less than about 500 M E (1.6 M J) will only be slightly larger in volume than Jupiter. [9] For masses above 500 M E, gravity will cause the planet to shrink (see degenerate matter). [9] Kelvin–Helmholtz heating can cause a gas giant to radiate more energy than it receives from its ...