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.
Types of Reverse Osmosis Water Filtration Systems Things to Know About RO Water Systems and Filters: The Way It Works, Types, Pros and Cons, How to Choose the One Reverse Osmosis water, or RO water, is resulted from a purification process called the reverse osmosis water filter.