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A volcano is an opening, or rupture, in the surface or crust of the Earth or a planetary mass object, which allows hot lava, volcanic ash and gases to escape from the magma chamber below the surface.
It's quite a nice discovery--probably the clearest example of a planetary mass object that's very young like this," says astrophysicist Philip Lucas of the University of Hertfordshire in England, who was not involved with the study.
In other words, nature appears to have more than one trick up its sleeve for producing planetary mass objects," said Professor Ray Jayawardhana, Canada Research Chair in Observational Astrophysics at the University of Toronto, who led the team.