Are we alone in the Universe?

The search for extraterrestrial intelligence and life beyond our planet is a fascinating area of scientific research with a history stretching back to the Ancient Greeks. Looking for alien life has gone hand in hand with learning more about our universe, with many famous and prominent astronomers and physicists believing that life must exist elsewhere in our universe. Yet it's also an area rife with pseudoscience and conspiracy theories. How do we sort fact from fiction?

This video introduces two of the big concepts in the hunt for alien life: the Drake Equation, which proposes a number of criteria we might use to gauge the likelihood of intelligent life existing in our universe, and the Fermi Paradox, which addresses the absence of evidence for other life forms outside our world and various explanations for why we are yet to encounter alien life.

The search for life offworld has moved from the realms of abstract philosophical pondering, through science fiction, into hard science in the last few decades alone. it was only in the 1990s that we conclusively knew of the existence of other galaxies, or had telescopes powerful enough to identify individual planets orbiting other stars. To date, we know of over 100 planets that meet our best guess criteria for supporting the development of life.

Our nearest planetary neighbours don't appear to host intelligent life, but scientists have not yet ruled out the possibility that living organisms once existed on both planets. Finding conclusive evidence that they did would radically shape our understanding of how life comes into being, as well as the likelihood of finding it elsewhere in the universe. If there is life on Mars, we have a lot to learn from it.

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Sent Into Space are the Near Space experts.

We use lighter-than-air gas balloons to travel to the upper stratosphere into Near Space, where you can see the curvature of the Earth (Flat Earth believers need not reply!), the black vacuum of space and the thin blue line of the Earth's atmosphere on the horizon.

This is more than just a GoPro on a weather balloon. We build a bespoke launch vehicle for each flight utilising the latest in camera technology and long-range radio and satellite communications. We film HD video of the Earth from space for stunning images of the curvature of the Earth.

[manjumourya]

I'm Indian and come from ri vlogs

[oldchannel]

Interesting thought- that perhaps life forms on earth came from other galaxies!

[anthonystars]

..there is a book by Tony Tymstra …here is a chapter you might find interesting ...the book is on amazon the link is below.
THE THEORY OF ONE
Life in the Universe is unique
The Theory of One suggests that everything in the Universe is
an essential substructure used to create and support life here on
this planet. Every single thing in the Universe is connected, and
everything in it is needed or was needed to produce this unique
place of life we called Earth. All the stars, all the galaxies, all the
planets, everything in the Universe helped produced this single
outcome. Life in the Universe only exists here and that Earth and the Universe are one place.
The Theory of One examines three principal elements for life
in the Universe to be unique.
1. Requirements.
2. Essential Conditions.
3. Necessary Connections and Cosmic Relationships.
A simple example of a Requirement for life is the need for
"sunlight." The Sun, which is a star, produces a broad spectrum
of energy in the form of charged particles and electromagnetic
radiation. Sunlight is only a small part of that spectrum. Plants
use sunlight directly by turning carbon dioxide into sugars in a
process called photosynthesis.

But deep in the ocean, there are some autotrophs, a type of
bacteria that do not need direct sunlight. They use the energy
from the Earth's hot core. These bacteria use chemicals like
methane and hydrogen sulfide emitted from hydrothermal
vents on the ocean's floor to make their food. They need the
Sun's energy indirectly; without this sunlight, the Earth would
not have enough of its own heat to sustain them.
The second principle element is the Essential Conditions, and
as such, this "required sunlight" needs a unique sun. This sun
will need to be the ideal candidate. We do not want a sun that
produces intense bursts of deadly gamma rays or x-rays for
example.
The third element is the Necessary Connections and Cosmic
Relationships that exist among all objects, both directly and
indirectly. Continuing to follow through with this sunlight
example, it would mean that this ideal sun and its delicate
attributes have established a unique relationship with this
planet. The Earth's magnetic field interacts with this "sunlight, "
providing a protective shield. This magnetic field is dependent
on the structure of the planet's molten core. And as such, the
Sun has a complicated relationship with Earth. It generates our
weather patterns, produces the albedo effect, and even helps to
develop vitamin D in the human body. The Sun's
electromagnetic radiation plays a role in a countless number of
other natural events here on Earth.

The emerging consequences from examining these three key
elements suggest that the "Requirements" for life are extremely
precise and that the "Conditions" are seemingly endless. More
importantly, these "Connections and Relationships" are
extraordinarily demanding and far-reaching. The Theory of One
goes on to say that these three principles produce an expanding
relationship and profound connective dependence, which
ultimately includes everything in the Universe. The Earth and
the Universe are indeed one place.
What are some of the logistical requirements for life to emerge
on Earth? Here on this planet, we have acquired the proper
blend of chemical elements needed to develop life. This correct
chemical balance was only possible because of this planet's
remarkable location in the Milky Way Galaxy. This planet's
position is critical because if the Earth formed closer to the
center of the Milky Way, then we would have acquired too
many of the lighter elements, and the existence of life would
have become highly unlikely. If, on the other hand, this planet
was formed farther out in the galaxy, we would then have too
many of the heavier elements and the possibility of life evolving
and flourishing would also be highly unlikely. We can continue
to expand on these aspects and requirements. For example, we
also need the Moon, but not just any moon. We need this Moon
and its exact properties.

The Moon stabilizes the Earth's motion producing a needed
steady and reliable weather system. The Moon also affects
Earth's plate tectonics, which in turn plays a role in our carbon
cycle. The Moon also produces the tides, which ultimately
helped develop life. Our Sun is 93, 000, 000 miles away (150
million kilometers), for life to exist on this planet we depend on
this Sun. It is an exceptional Sun; it is one which is not too hot
and not too cold. This Sun needed to be in a stable state and in
the proper stage of development long enough for life to develop
on Earth. Not only do we need this Sun to be the right type and
size of star, but we also need it to be in the correct position and
distance. Now, if the Sun were just a fraction of a distance
closer, then Earth's water would have eventually evaporated
into space. And yet, on the other hand, if it were a fraction of
the distance further away we would have become a cold dead
planet of ice.
This Sun has its' own vast complex requirements and "far off"
external influences. Those cosmic interactions ultimately
complement and support our existence. And those "far off"
external influences and interactions demand their own
requirements. Furthermore, we need a solar system with
massive planets like Jupiter and Saturn. These planets protect
us. They shield this planet from incoming asteroid disasters and
comet impacts—these giant planets "sweep clean" our solar
system.

We needed and still need their size and gravitational strength
to prevail, even though these planets are millions upon millions
of miles away. But it doesn't end there. Just these two planets
alone have many of their own cosmic prerequisites. They have a
vast number of critical conditions and precise requirements,
which are also complicated and far-reaching. All these
conditions and requirements are time-sensitive; they all need to
be created within a similar time period. That requirement alone
is an incredible plight.
We can continue to expand the idea behind the Theory of One.
The Milky Way Galaxy, which we are located in, has its own
vast complex requirements and correspondence. As such, it
interacts with other galaxies, which in turn have their own
interactions and conditions. These direct and indirect
relationships support our existence and extend the connection
to everything in the Universe. It is truly remarkable. This
network does not stop or fade away with distance.
In conclusion, The Theory of One suggests that everything in
the Universe is connected and is required to support life here on
this planet. Is it possible for life to exist elsewhere in the
Universe? I can imagine it, but the necessary conditions to reoccur somewhere else would be astronomically rare, with an
outrageously small probability. We are probably unique in this Universe.

[Nichol._]

Actually were not alone in universe cause there is many different universe