It was in May 12, 2009 that NASA's Kepler Space Telescope started its journey to find Earth-like planets. It is now three and half years and the telescope has completed its primary journey.

It is now said that the telescope is going on a new mission, which can be for four more years. Scientists involved in the mission were of the view that they have been able to find more than 100 planets. Not only this, it has been found that more than 2,300 planet candidates are also present.

It shall be noted that there are planets, where water might be existing. "The initial discoveries of the Kepler mission indicate at least a third of the stars have planets and the number of planets in our galaxy must number in the billions", said William Borucki, who is the lead investigator at the Kepler mission.

He said that they have been assessing the planets, and it would not be wrong to say that best things in the mission have yet to take place. There are as many as 840 planets being detected by the Kepler, but only those planets will be selected, which will fulfill the criteria of being habitable.