My reading of the article is that scientists are puzzled by the the evidence for large amounts of liquid water, not just life. If you look back in the past and

My reading of the article is that scientists are puzzled by the the evidence for large amounts of liquid water, not just life. If you look back in the past and see ice, but also life, geothermal is relevant. But they see rivers and oceans, so you have to focus on bigger solutions.