E3: Exploring Europa's Environment

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"Europa is cold --- really cold.  The survace temperature is a chilly -260 degrees F, so bring your space parka.  The entire planet is covered with a relatively smooth layer of frozen water and ice skating is allowed in most regions.  Travelers should bring their own air, as Europa's oxygen atmosphere is a 100 billion times thinner than Earth's.  Other items of note include cold water volcanoes, gigantic ice rafts, and an underground ocean.  Ice fishing is not encouraged."

(Source:   http://science.nasa.gov/newhome/headlines/ast09sep99_1.htm )