Many planets outside the solar system have higher chances of life existence due to their earth-like size and a constant distance maintained by them to their sun. Researchers have said that circular orbit of planets is vital to give rise to life.

Now, a new research published in the Astrophysical Journal has suggested that planets of nearly the same size as earth follow a same circular orbit, thereby increasing chances for next frontier to find life outside the solar system.

After looking at 74 exoplanets located hundreds of light years away, researchers from Aarhus University in Denmark and MIT found that each of these planets are orbiting the center of its own solar system in a circular path. NASA's Kepler space telescope helped the scientists to gain insight into the orbital periods of these planets.

The two most intriguing facts about these planets are their similar-to-earth size and their path to orbit which put them at a constant distance from their host star while orbiting their circular trajectory.

"Our findings are helpful in identifying which planets are habitable because the location of the habitable zone depends on eccentricity, and to determine occurrence rates inferred for these planets because planets on circular orbits are less likely to transit", said the researchers.

The researchers said that odds of life existence are higher in small planets that follow a circular orbit. They have stable climate throughout the year, whereas dramatic climate chances take place in planets with eccentric orbits.

Size of planets also plays a significant role in hunt for life as they need to be about the same size as earth in order to be habitable.