Icy Worlds Might Be Alive on the Inside

Many small, frozen worlds seem to have warm underground oceans, making the search for alien life more exciting — and more confusing.

RELATED TAGS: EXTRATERRESTRIAL LIFE
Europa
“Follow the water.” That’s been a guiding principle in the modern search for extraterrestrial life, based on the overwhelming evidence that all living things on Earth — no matter how exotic or extreme — require water to survive. For the past two decades, this emphasis on water has focused attention on Mars, where NASA has intently sought evidence of ancient rivers or modern trickles. Each eroded pebble and layer of sediment there has been heralded as an important cl...
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