Asteroids that orbit close to the Earth inevitably cause us some anxiety due to the even remote possibility of a collision. But their proximity also offers ample opportunities to learn more about the universe. Ryugu, a 900-meter diameter asteroid in the Apollo belt, has recently proven useful in our search for signs of life's precursors elsewhere in our solar system.
Based on what we know about the universe, isn’t this pretty obvious? I’d rather see estimates for how much water?
The big discovery was salty water, not water.