A subsurface ocean, an oxygen atmosphere and potential for life.
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Scientists believe that there is liquid water, under the crust of Europa.
Europa is the sixth moon of the planet Jupiter.
The moon scientist think might have life is Europa. It has oceans 3 to 60 miles under ice.
Water
They believe there is liquid water underneath its frozen surface. If there is liquid water on Europa, there might also be life.
The scientists think that Europa can have the life on it.
I think it might be Mars... or maybe Europa.
A saline ocean beneath it's crust.
As far was we know the development requires water in its liquid for to be present and a source of energy to supply/drive chemical reactions. We know that deep down Europa has a liquid layer (of water) and the geysers of this water into space proves that there is energy in Europa's core.
Rock and iron
The tectonic plate-like movement of its icy surface and various measurements indicate that Europa has a subsurface ocean of liquid water. Liquid water is considered the most important factor for a world's ability to have life.