The planet which is located outside our solar system is known as an exoplanet. The discovery of exoplanets has escalated interest in the search of extra-terrestrial life. The researchers found that if a planet has a rocky surface like earth and it gets light from its hot star then there are chances of life development on that planet. Life on earth was developed by a chain of chemical reactions powered by UV light which produced aspect of life. Similarly, host stars which release ultraviolet light could lead to the creation of life on their orbiting planets.
A range of planets has been recognized where sufficient UV light is released from their host star for chain reactions to take place. These planets lie within the good enough range i.e. habitable zone where liquid water can exist on the surface of the planet. The habitable zone is the most important approach; life is not fulfilled with only water. Therefore, the scientists started looking for another aspect of life i.e. about ultraviolet radiations for creating building blocks of life.
There are some ideal conditions under which life is possible. The study of chemical reactions at different temperatures that too with UV light and without UV light was done by the researchers. “There is a difference between the chemistry happens in the dark and the chemistry which happens in the light”, was said by senior author professor Didier Queloz. The chemistry which happens in dark is slower than that of light. Experiments were done in the dark as well as light with the hydrogen cyanide and the hydrogen sulfite. The experiments in dark resulted in a less strong or lacking the ability compound which was not capable of the creation of building blocks of life. While the experiments performed under lights resulted in the essential building blocks.
After comparing both the chemistries, plotting of the amount of UV light available to the planets in orbit around host stars was done resulting in the point where chemistry could be activated. The experiment resulted in stars having a similar temperature to sun emitted light through which building blocks of life can be formed on the surface of planets in its orbit.