Estimates by astronomers indicate that there could
be more than 100 BILLION Earth-like worlds in the Milky Way that could be home
to life. Think that’s a big number? According to astronomers, there are roughly
500 billion galaxies in the known universe, which means there are around
50,000,000,000,000,000,000,000 (5×1022) habitable planets.
That’s of course if there’s just ONE universe. In
fact, just inside our own Milky Way Galaxy experts now believe are some 400
BILLION STARS, but this number may seem small as some astrophysicists believe
that stars in our galaxy could figure the TRILLION. This means that the Milky
Way alone could be home to more than 100 BILLION planets.
However, since astronomers aren’t able to see our
galaxy from the outside, they can’t really know for sure the number of planets
the Milky Way is home to. They can only provide estimates. To do this, experts
calculate our galaxy’s mass and calculate how much of that mass is composed of
stars. Based on these calculations scientists believe our galaxy is home to at
least 400 billion stars.
There are some calculations that suggest that the
Milky Way is home on an average between 800 billion and 3.2 trillion planets,
but there are some experts who believe the number could be as high as eight
trillion. Furthermore, if we take a look at what NASA has to say, will find out
how the space agency believes there are at least 1,500 planets located within
50 light years from Earth.
These conclusions are based on observations taken
over a period of six years by the PLANET—Probing Lensing Anomalies
NETwork—collaboration, founded in 1995. The study concluded that there are way
more Earth-sized planets than Jupiter-sized worlds. In 2013, Dr. Phil Yock,
from the department of physics at the University of Auckland said how:
“Kepler finds Earth-sized planets that are quite close to their host stars, and astronomers estimate that there are around 17 billion such planets in the Milky Way. These worlds are hotter than our planet, although some could be of a comparable temperature (and could, therefore, be habitable) if they are orbiting a cool star called a red dwarf. Our proposal is to measure the number of Earth-mass planets orbiting stars at distances typically twice the Sun-Earth distance. Our planets will, therefore, be cooler than Earth. By interpolating between the Kepler and MOA results, we should obtain a good estimate of the number of Earth-like, habitable planets in the Milky Way. We predict a number in the order of 100 billion. Of course, it will be a long way from measuring this number to actually finding inhabited planets, but it will be a step along the way.”
The number seems to be increasing every year, which
is kinda cool. If we take a peek at the recent data provided by the Kepler
space mission, we’ll find how astronomers believe approximately 40 BILLION Earth-sized
planets orbiting habitable zones of Sun-like stars and red dwarfs in the Milky
Way galaxy alone. Since NASA’s Kepler was launched in 2009, the space telescope
has discovered a total of 4,034 potential alien planets, of which 2,335 are
verified exoplanets.
Interestingly,
some astronomers say that around 11 billion planets may be orbiting Sun-like
Stars, while others believe this number is more like 100 billion. In 2017 NASA
made great progress in the search for alien planets. Their most noteworthy
discovery was the solar system Trappist-1, home to SEVEN Earth-like planets who
may even be home to alien life.
This particular solar system is very important. In
June of 2017, NASA revealed a statement saying that they had discovered ten new
planets outside of our solar system that is very likely of similar size and
temperature as Earth and may even have life developed on their surface.
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