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 Systems. Reverse osmosis water filter systems (RO Systems) have become a common method for the treatment of household tap and drinking water. The reverse osmosis water treatment process filters undesirable materials from water by using pressure to force the water molecules through a semi permeable reverse osmosis membrane.