Pluto is listed on the Planetoids page.
↓ Satellite Atmospheres ↓
|Phosphine detected on Venus (JUL): "Phosphine gas in the cloud decks of Venus," Greaves et al. Nature Astron 5, 655-664 (2021). Please also see here for an extended summary of the efforts of Greaves at al. and currently available peer-reviewed work confirming and disconfirming the presence of phosphine on Venus and the implications thereof.|
For the most part, the moons of the solar system have very tenuous atmospheres
(known as exospheres) that consist of volatile molecules created when surface materials are subject to
irradiation by the solar wind or by ions accelerated by the magnetic field of the planet to which the satellite
belongs. The one moon with a dense atmosphere is Titan, where the pressure at the surface is about half again as
much as the pressure on Earth at sea level. Io has volcanoes that erupt gases into its atmosphere.
|MOONS OF JUPITER|
|Callisto||CO2 (1992) O2 (2003)|
|Europa||O2 (1995) H2O (2019)|
|Ganymede||O3 (1996) O2 (1998)|
|Io||SO2 (1990) SO (1996) S2 (2000) NaCl (2003)|
|MOONS OF SATURN|
|Dione||O3 (1997) CO2 (2016) O2 (2016)|
HCN (1981) C4H2 (1991) HC3N (1991) C2N2 (1991)
N2 (1982) CO (1983) C2H2 (1984) H2O (1998)
C3H8 (2003) C6H6 (2003) HNC (2011) C4N2(nd) (2015)
C2H5CN (2015) C3H4 (2019) c-C3H2 (2020) CH3C3N (2020)
|MOONS OF NEPTUNE|
|Triton||CH4 (1979) N2 (1989) CO (2010)|
Image credit: https://phys.org/news/2015-02-solar-yearbook.html
Listings of molecular species found in the atmospheres of the planets are taken in part from Photochemistry of Planetary Atmospheres by Y. L. Yung & W. B. DeMore (Oxford University Press, New York), 1999.
Images of the planets are adapted from Views of the Solar System by Calvin J. Hamilton.