So how many stars are there in the Universe? It is easy to ask this question, but difficult for scientists to give a fair answer! Stars are not scattered randomly through space, they are gathered together into vast groups known as galaxies. The Sun belongs to a galaxy called the Milky Way.
Reverse osmosis. Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water.
Reverse osmosis (RO) systems can often improve the. quality of water. The reverse osmosis water treatment. method has been used extensively to convert brackish. or seawater to drinking water, to clean up wastewa-. ter, and to recover dissolved salts from industrial. processes.