The fact that Earth is the only planet having life in the entire universe is a bit unacceptable to the researchers on this planet. It has always been felt that there might be some other planet having life just like us which is the reason why water and other forms of life are being searched on mars or the moon of Saturn.
It is always not practically feasible to send spaceships on different planets for this purpose. Therefore under such circumstances, researches of this kind are done only with the help of high end telescopes or with a space photometer.
One Such telescope/photometer has been developed by NASA to search for another earth or earth-like planets in this universe. Kepler is the name given to this space photometer and this name has been given in the honor of Johannes Kepler, a famous scientist of 17th century.
Kepler will observe the brightness of over 100,000 stars over 3.5 years to detect periodical transits of a star by its planets.
Kepler will work to achieve the following goals:
- Determine the number of terrestrial and larger planets there are there in or near the habitable zone of a wide variety of spectral types of stars.
- Determine the range of sizes and shapes of the orbits of these planets.
- Estimate how many planets are there in multiple-star systems.
- Determine the range of orbit size, brightness, size, mass and density of short-period giant planets.
- Identify additional members of each discovered planetary system using other techniques.
