What makes life in the universe possible? There are many different factors that play into the possibility of life. Out of the billions of galaxies, it’s estimated that only one out of every ten are able to harbor life and only 44 percent of F6-k3 of main sequences stars around our galaxy have the possibility of sustain life (solstation.com). There are certain molecules needed to create and sustain life and only certain stars can harbor life. The possibility of life in the universe has many different factors. Life requires usable energy sources. For organisms on earth, they must be able to metabolize or use these energy sources. The earth organisms are able to assimilate energy from organic and inorganic sources and some are even able to metabolize sunlight and turn it into energy (text book). If earth did not receive sunlight from the sun it would not be able to continue to make the energy needed; this would result in equilibrium and there would no longer be a way for energy to be made. Life also needs carbon for its most basic functions; such as metabolism, reproduction, and evolution (text book). There are other molecules, nitrogen, oxygen, hydrogen, phosphorus, and sulfur to name a few, that play important roles (text book). Without an abundance of hydrogen and oxygen water would not exist. Water plays an important role as a solvent, which allows for chemical reactions to take place (text book). For there to be life, there must be a source of energy, a star, and somewhere for life to thrive, such as a planet. There are different types of planets that are thought to be habitable. These planets are: Super-Earths, which are two ties the size of Earth; water worlds, which range in size but have deep oceans and the possibility of habitable land; and Earth-like planets, these planet are found in their host stars habitable zone, have the possibility of liquid water, and range in size from one half the size of the Earth’s mass to