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.