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 (RO) is among the most popular means of effective home water purification because ability to deliver bottled-water degrees of safety and taste. In fact, the top bottled-water companies actually use large-scale RO to create their water.