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en.wikipedia.org/wiki/Atmosphere_of_Mercury

Mercury has a very tenuous and highly variable atmosphere (surface-bound exosphere) containing hydrogen, helium, oxygen, sodium, calcium, potassium and ...

www.space.com/18644-mercury-atmosphere.html

Oct 17, 2016 ... But Mercury isn't ideally located for an atmosphere. ... observations suggested that oxygen made up 42 percent of the tiny planet's atmosphere.

www.windows2universe.org/mercury/Atmosphere/atmosphere.html

Aug 11, 2010 ... Mercury's thin atmosphere contains hydrogen, helium, and oxygen. ... Others are made by radioactive decay or when micrometeorites smash ...

www.universetoday.com/22088/atmosphere-of-mercury

Mar 12, 2012 ... What is Mercury's atmosphere made of? It has a tenuous atmosphere made up of hydrogen, helium, oxygen, sodium, calcium, potassium and ...

www.spaceanswers.com/solar-system/what-is-mercurys-atmosphere-like

Dec 10, 2014 ... Asked by Lana Freedman. Mercury's atmosphere is incredibly thin. With a mass of about 5.5 per cent that of the Earth this planet has a far ...

sciencing.com/chemicals-make-up-mercurys-atmosphere-8800.html

Apr 25, 2017 ... Among other discoveries, the 2008 Messenger spacecraft mission has revealed new information on the chemicals that make up Mercury's ...

solarsystem.nasa.gov/planets/mercury/indepth

Instead of an atmosphere, Mercury possesses a thin exosphere made up of atoms blasted off the surface by the solar wind and striking micrometeoroids.

www.kidsastronomy.com/mercury.htm

As a result, Mercury is made out of a large percentage of heavier elements, mainly ... Mercury is too small and has too little gravity to hold onto an atmosphere.

cseligman.com/text/planets/mercatmos.htm

Discussion of what passes for the atmosphere of Mercury. ... The amount of such ' air' must be very, very small, and it is made almost entirely of hydrogen ...