In the mean time, scientists have studied in detail about 500 or more areas in space having thousands of such planets . But it is a matter of great regret that they are unable to detect a planet like our mother earth having life on it .
We have great hope on our neighboring red planet which is at a distance of 230 million km. from sun.
Sometime ago , there was a rumor in the USA that the terrestrial bodies from mars arrived there to attack earth . A great sock was speared among the people .They came out of their home to have a look of them. The police administration took a month or so time to control over the situation.
Again while noticing a thread-like structure on mars in 1862, the famous scientist ,Giovanni , described it as a river on it . Later it was found not to be true .So many spacecrafts like Pathfinder, Spirit mars rover, Opportunity and Curiosity have landed on mars. Observing the data received from Curiosity, last March, there is no hope of life on the planet . May be, there have been unicellular bodies on it long ago .But the main element of life i.e. amino acid is not found here now.
Scientist , during their search last year ,can find such a planet where water –like substance and air-like substances are present there. They study the nature and behavior of the planet with great interest . But when they calculate the budgets and other things , a sadness appears on their face. It is because while it has been difficult for a short-lived man to move within our solar system , how can he reach the planet ,which can take at least 50,000 years to land there with the help of the most sophisticated rocket .
It is true that the 21st century man has not find or has not generated data about the intelligent life on another planet in the Universe, but the idea of its presence cannot be ruled out .
Links for reference : http://newearthplanets.blogspot.in/