NASA’s Kepler Space Telescope recently discovered an Earth-like planet orbiting a nearby star within the habitable zone of our galaxy. Kepler-186f is approximately 500 light-years from Earth which may make summer holidays a bit tricky.
The habitable zone, also referred to as Goldilocks zone, is the region around a star within which planetary-mass objects with sufficient atmospheric pressure can support liquid water at their surfaces. It has been estimated that there are at least 40 billion Earth-sized planets orbiting in our Milky Way Galaxy, but this particular discovery is labelled the first Earth-sized planet to be found in the habitable zone of another star.
What’s the meaning of all this?
In addition to Kepler-186f, there are 4 other planets that orbit a nearby star within the same system. What this means is that if the nearby star to this planet is similar to our Sun, then the probability of life on this planet exponentially rises. It’s exciting to think that we could introduce the residents of Kepler to selfies, truth or dare, or maybe even twerking if they are friendly enough.
“We know of just one planet where life exists – Earth. When we search for life outside our solar system we focus on finding planets with characteristics that mimic that of Earth,” said Elisa Quintana, research scientist at the SETI Institute at NASA’s Ames Research Center in Moffett Field, “Finding a habitable zone planet comparable to Earth in size is a major step forward.”
The nearby star to Kepler-186f has half the mass and size as our solar system’s Sun and only receives one-third of the energy that we receive from our Sun. Kepler-186f orbits its star once every 130 days.