Ra Patera

{{Short description|Volcano located on Io}}

File:Volcanic crater with radiating lava flows on Io.jpg image showing lava flows radiating from Ra Patera at lower left (March 5, 1979).]]

Ra Patera is an extraterrestrial volcano located on Io, one of the four Galilean moons of Jupiter. An active volcano, it was first studied in 1979 via Voyager stereo imagery to determine its geology, topography, and the source of its eruptions. When first discovered, the mountain reached about one kilometer in height and featured numerous lava flows of either low viscosity or "high eruption rates".{{cite web|url=http://www.lpi.usra.edu/science/schenk/RESEARCH/ra.pdf|title=Geology and Topography of Ra Patera, Io, in the Voyager Era: Prelude to Eruption|date=September 15, 1997|accessdate=June 13, 2010}} It is possibly a liquid sulfur-erupting volcano.