Does alien exist? Do they come to Earth?

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This question often comes up whether there is life outside the earth? If there is life outside the earth, is there a presence of intelligent life like a human in that life?

Rumors of UFO / UDANSTAR being seen all over the world / so-called news are coming out. Even in Hollywood movies, alien/alien is a major storyline, in these films they are mostly presented as villains whose motive is to consume the natural resources (water/gold/ minerals) of the earth or to make mankind their slave Use as a caste.

Does alien exist?

According to current science, there is no reason for life not to grow outside the Earth. There is no such feature in the Earth or the Solar System that there is a possibility of life only on Earth.

Scientists believe that materials and conditions exist for the origin and development of life even in outer space. Our galaxy has about 200 billion stars, of which our Sun is a normal star. The width of the Milky Way is one million light-years and the thickness is about 20 thousand light-years. Our Sun is also not in the center of the Milky Way. It is about 30 thousand light-years away from the center and continues to revolve in the Milky Way. There are billions of such and different skies in the universe. Beyond our galaxy, Devyani, another large galaxy, is about two million light-years away from us. The far-flung sky of the universe is about 10 billion light-years away from us.

So, in this vast universe, apart from earth, is it lifeless everywhere? 

The elements from which the things of the earth are formed are found almost all over the universe. The laws of physics apply to the objects of the earth, while the same rules apply to the objects of the most distant bodies. Therefore, it cannot be said that only on earth the origin and development of life are possible. Life of other advanced civilizations is possible on other bodies of the universe.

To calculate advanced civilizations in the galaxy, astronomer Frank Drake of College, University USA has presented an equation, which is called the Drake equation. Calculate the average rate of star birth in the galaxy, the number of stars on the planet, the number of planetariums, the number of planets that can sustain life, the number of planets that can give rise to beings with advanced technology, the lifetime of advanced civilians, etc. The prevalence of life in the galaxy is explored with the help of the Drake equation. Scientists have discovered that there are millions of stars like our Sun in the 200 billion stars of the galaxy, so we cannot consider our star (Sun) as unique. Eminent astronomer and popular science presenter Carl Sagan has discussed this equation so many times that it is also known as Carl Sagan's equation.

In 1961, Frank Drake estimated that about 10,000 planets are possible in our galaxy itself. 40 years after that equation, Drake's method was further reformed in 2001, and then the equation was said that life is possible in thousands and not millions of planets.

That is, if there is life on earth, there will be life elsewhere. The answer to our first question is that the existence of alien is possible.

Can aliens attack Earth?

Probably not. The distance between the stars is very high. Proxima Centauri, the star closest to the Sun is 4 light-years away, it takes 4 years for the light to reach us. The speed of light is very high, it travels about three lakh km in a second. It takes only eight minutes for light to reach the Earth from the Sun for comparison. It would take hundreds of years for even our fastest rocket to travel this distance to cover a distance of several light-years.

There is a lot of hindrance in such a long journey, in which such a long journey of many years will not be easy for humans or any other intelligent organism. There will be a lot of practical difficulties in the construction of the traveling vehicle, like ration, water, clothes, energy will have to be arranged for this long journey in this vehicle. It will not be possible to carry food items of many years in the vehicle, in such a situation, arrangements will have to be made to grow agriculture, trees, and plants in the vehicle itself. A power plant will have to be constructed for the operation of the huge vehicle and for the construction of energy for the use of passengers.

In the vehicle, by filtering toxic gas like carbon dioxide from the air, plants would be wanted in the production of oxygen. Plant for reuse of used water, plants will be needed for reuse of generated waste. By putting all these plants in the vehicle, it will become the size of a small city. It is not easy to build such a large vehicle on earth or planet and send it to space, this size vehicle will also have to be built in space.

Even if such a huge vehicle is built, the astronauts of this craft will have to prepare themselves mentally and physically. The team of astronauts of the vehicle will have to choose experts from every field, in which engineers, astronomers, doctors, etc. will be the chief. If the travel time is more than 30-40 years, then the men and women couples will have to be sent on these trips, so that a new generation of new passengers will be prepared on such a long journey and they should take this journey forward. In this state, schools and teachers will also be wanted in the vehicle.

In view of all these difficulties of the long journey, it is clear that the journey from the traditional way to other planetariums is extremely difficult and challenging. The solution to this difficulty is the construction of light or faster speed vehicles. Keep in mind that even the fast-moving light will take at least 8 years to travel from the nearest star, while the distances in space are hundreds, thousands or millions of light-years.

Light speed

The biggest problem in traveling faster than light speed is that according to scientific regulations, traveling at or faster than light speed is not possible. This is a violation of Einstein's theory of relativism according to which light speed is the maximum limit of any particle. Any object that holds its mass cannot receive light; He needs infinite energy to achieve light, which is not possible.

Suppose in some way this rule of relativism was broken and a vehicle traveling at the speed of light was also made. At this stage, there will be a problem with Time Dilation. We know that the speed of time is not always the same. The speed of time will slow down in a light-moving vehicle, while the speed of time on the Earth / alien planet will be normal. It will take 4 years for a light-speed vehicle to reach Proxima Sentari from Earth, but centuries will pass on Earth.

For all these experimental reasons, alien does not seem possible on earth.

Travel by wormhole

Another solution is to travel through the wormhole. A wormhole is a theoretical shortcut that connects two points of space. Their existence is not proven but it is theoretically possible. It is possible to travel to any distance in the blink of an eye. You enter from one end of a wormhole and in the blink of an eye, you can go to another galaxy or any other planetarium. We do not have the technology to make such a wormhole. To get the technology to make human civilization a wormhole, thousands of years or millions of years of technical development will have to be done.

The civilization that produces such a shortcut will be millions of years ahead of us, not thousands. Why would such a developed civilization be interested in the earth? For them, we will be a primitive Stone Age creature. They will not be interested in any of our things (because they will be able to build everything in a pinch. There is no shortage of things like mineral resources, water, gold in space, they will be able to get them just like that. Human beings will not have any need to create a slave caste because they will have an army of robots to do their every work.

For a developed civilization that can build a wormhole, we will be no more than insects. Do you think by yourself whether you have any interest in the arms of a dimmer, or a group of ants? Do you think to attack them?