A finite universeâthat is, a universe of limited sizeâeven one with trillions and trillions of stars, just wouldn't have enough stars to light up all of space. Although the idea of a finite universe explains why Earth's sky is dark at night, other causes work to make it even darker.Not only is the universe finite in size, it is also finite in age.lthough the idea of a finite universe explains why Earth's sky is dark at night, other causes work to make it even darker. Not only is the universe finite in size, it is also finite in age.
Noun. 1. litmus-a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator. litmus test. acid-base indicator-an indicator that changes color on going from acidic to basic solutions.
Litmus test is a test done to find out whether a given compound is acidic, basic or amphoteric in nature. It is a natural chemical indicator that shows color change with pH(hydrogen ion concentration) change. While acid turns blue litmus red a base or alkali turns red litmus blue.