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 in the Cygnus
constellation.
The habitable zone, also known as the Goldilocks zone, is
the region around a star within which planetary-mass objects with sufficient
atmospheric pressure can support liquid water at their surfaces. While it has
been estimated that there are at least 40 billion Earth-sized planets orbiting
in our Milky Way Galaxy, this particular discovery is labeled the first
Earth-sized planet to be found in the habitable zone of another star.
What does this mean?
In addition to Kepler-186f, there are 4 other planets that
orbit a nearby star within the Kepler-186f 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.
“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, Calif., and lead author of the paper published today in the journal
Science. “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.
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Source :themindunleashed.org