Aliens
Meaning of Aliens:
The Term Alien has several meanings one of them is coming from another planet [Extraterrestrial] or something that does not belong to this planet.
How Life formed on Earth?
The condition of Earth is perfect as it contains all suitable conditions for better survival. Literally, Everything in this Universe is all the particles from the Bigbang explosion. Life on earth started with a single cell up to which is now.[Development of different forms of Life].
Simple organic compounds collided into complex collisions and they must be the very first life on earth that can grow and reproduce.
During the early times, the earth's atmosphere and the environment were completely in a different form compared to now, the earth had multiple volcanic activities and a relatively very hot atmosphere. So life must be formed in liquid solvent water where atoms could collide with each other.
For survival all life needs a source of energy, life forms that produce energy automatically are called autotrophs like plants and heterotrophs like animals that get energy from other organisms.
Are there Aliens on other planets?
Well, there are millions of planets in this Universe if we see the probability there must be other planets that may also contain life or that are suitable for better survival. Since protein is the same all along with the Universe there may also be another planet like Earth that may contain Life. Scientists also discovered a planet called Kepler 452B, which is called the cousin of the earth as it contains all characteristics like Earth.
There are several antennas on this planet to receive to detect strong radio signals from outer space. Back in 1977, a signal detected from our nearest neighbor star Proxima Centauri at its meaning is WOW
Why we didn't see any aliens till now?
According to prof. Stephen Hawking more and more development will lead to extinction. If there are aliens, after gaining full development of their technology they maybe self-destructed themselves like us what we are doing to our Earth now...
So, Ultimately Earth may not be the only planets among the other billion planets that contain Life. Scientists strongly believe that there must be another form of life somewhere in this Universe. Scientists are still sending Radio Signals to the space waiting for a reply from the vast space...
Conclusion :
Hope it may clear your doubts about aliens, and you may know about the formation of life on earth and whether it is possible to any other form of life in this universe.
"The main thing about Aliens is that they are Aliens. They feel no responsibility for fulfilling any of your Expectations"
-Robert Silverberg
Authors: Jetson Samuel, Sankareshwaran
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