Why are potential deep liquid reservoirs considered the most promising environments for extant Martian life?

Answer

They offer stable temperatures and protection from surface radiation.

Deep liquid reservoirs, if they exist beneath kilometers of ice and rock, provide stable temperatures and shield potential microbial life from the harsh surface environment, including damaging radiation.

Why are potential deep liquid reservoirs considered the most promising environments for extant Martian life?

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Astronomers Found Oceans of Water on Mars - YouTube

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