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And water. Water is an important thing too, to find. That's for life as we know it on Earth here. Here on this planet, water is absolutely essential. Not to say it's essential for other life forms, but it is here on Earth. So for us looking for water, then finding it, there's another piece of compelling evidence that there could be life outside of the solar system. Some of the planets, some of the moons of some of the giant gas planets within our solar system, Jupiter and Saturn, some of them have ice worlds, and underneath the ice there's oceans of liquid water there. And so scientists are quite excited about trying to punch through these, trying to see what's exactly beneath the ice, and hopefully they may find some life there.