" but a new study suggests that the H2O could be coming from the Sun." -- This is not new!!! This is from 2009!!!
"Chandrayaan-1's measurements suggest that the water sits in the upper few millimetres of the lunar surface. As a result, Pieters and colleagues favour a scenario in which the water is created when hydrogen atoms carried by the solar wind slam into oxygen-rich materials in the lunar surface, combining to form hydroxyl and water."