Why are scientists obsessed about finding water on Mars?
The latest update from NASA Curiosity team is that the rover has drilled the Red Planet to find traces of water. It has completed drilling (for the first time by any bot on Mars) and has collected enough samples to analyse and see if water existed on Mars. Here's how the drill spot looks -

I'm more interested in knowing what's making NASA spent so much of time, energy and money on discovering water on the distant planet? Are humans planning to setup civilisation on Mars? It's already known that Mars' thinner atmospheric blanket can't retain energy and may not be suitable for humans to survive.
What's the real reason behind the quest for water on Mars?

I'm more interested in knowing what's making NASA spent so much of time, energy and money on discovering water on the distant planet? Are humans planning to setup civilisation on Mars? It's already known that Mars' thinner atmospheric blanket can't retain energy and may not be suitable for humans to survive.
What's the real reason behind the quest for water on Mars?
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