Life on earth

Life is really short. You must change the way think and do. Start living your life. Do the best to live your life. Begin enjoying what God has given to you. Think and do something about it. And create something from it.

---

The Earth is the only planet in the universe known to have life. The Drake Equation, which put into account the number of extraterrestrial civilizations in our galaxy with which we might contact, was used to discuss the probability of life elsewhere, but scientists disagree on many variable at this equation values. Based on these values, the equation may either suggest that life arises, often or rarely.

The region around a main sequence star that could support life like the Earth on a planet like the Earth is known as the habitable zone. The inner and outer of the zone varies with the brightness of the star, as well as the time interval during which the area survive. More massive than the sun Stars are more habitable zone, but will remain on the main sequence for a shorter time interval during which life can evolve. Small red dwarf stars have the opposite problem, compounded with higher levels of magnetic activity and the effects of tidal locking from close orbits.

Thus, the stars in the range of intermediate mass as the Sun can have the best conditions of life similar to Earth to grow. The location of the star in a galaxy can also affect the probability of life forming.

Panspermia, also called Exogenesis is proposing a hypothesis that life originated elsewhere in the universe and was subsequently transferred to Earth as spores perhaps via meteorites, comets or cosmic dust. However, this hypothesis does not explain the ultimate origin of life.