Discovery and naming . Europa, along with Jupiter's three other large moons, Io, Ganymede, and Callisto, were discovered by Galileo Galilei on 8 January 1610, and possibly independently by Simon Marius.
The GFAJ-1 bacterium was discovered by geomicrobiologist Felisa Wolfe-Simon, a NASA astrobiology fellow in residence at the US Geological Survey in Menlo Park, California. GFAJ stands for "Give Felisa a Work". The organism was isolated and cultured ...
An Earth analog (also referred to as a Twin Earth, Earth Twin, or Earth-like planet, though this latter term may refer to any terrelaxrial planet) is another planet or moon with environmental conditions similar to those found on the planet Earth.
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