According to research, the entire stretch of the universe happens to be 93 billion light-years. There are 2 trillion galaxies. Each of these galaxies has millions of stars and has more planets beyond your imagination. Therefore, it’s highly unlikely that humans are alone in this vast expanse. With that being said, there hasn’t been much evidence to prove that. Scientists have spent lots of years in search of civilization from the other world. So, do humans have the entire cosmos to themselves? There is enough doubt regarding that. If statistics are to be taken into account, there can be several locations where humans can thrive.
Frank Drake made similar suggestions – back in the year 1961. He put forward the fact that technically advanced civilizations could be the product of seven variables. They comprise the number of stars across the Milky Way galaxy, the number of gas balls that throw light on the planets, and how many such worlds can actually provide a suitable environment to support life. There are speculations about the variables put forward by Drake. As per the astronomers, the exoplanets which are said to harbor life, are spread across the galaxy like those dust particles that you often find under your couch. Over the last twenty years, researchers have detected the presence of over 4000 planets in the Milky Way galaxy. Christopher Conselice, an astrophysicist from the University of Nottingham, revealed that the number could very well be around 100 quintillions. Some believe the number can be greater.
Different scientists hold different opinions regarding the number of planets that could provide a suitable environment for humanity to thrive. If a common estimate is taken into account, there can be tens of billions of planets in the neighborhood which could be perfect for the inception of life. Astronomers opine that human beings were created on earth through complex biochemistry that took place once or even more throughout 13.7 billion years. Experts though agree to a common fact that the universe is brimming with life and anything otherwise would be against physics.
The next question which is bound to crop up is that if the universe is full of life, then where is everyone? This was the question that was put forth by Enrico Fermi, an eminent Italian physicist in the year 1950. Many scientists argue that planets that exist before the creation of earth can boast of some extra-terrestrial beings that might possess advanced technology to send us a signal indicating their presence. This is, what the astronomers believe, is intelligent life. If that is the case, then it can be assumed that any being outside our solar system wants to contact us. Alien beings might prefer to not let their presence be known that much to stay away from interstellar bullies. They might not have the optimum technology required to reach us or we might lack the means of receiving their signal and deciphering their messages. The distance might also be a factor. Scientists say that one more probable fact is that other civilizations might have existed from the beginning and have now been obliterated owing to some catastrophe in the cosmos.
Many astronomers stated that humans haven’t been able to find anyone till now, which is more logical. Space is a vast expanse and it’s not that easy to find out what’s going on at some other end of the expanse. Moreover, scientists also haven’t looked farther than the neighborhood. Jill Tarter, a retired astronomer, says that if there have been the oceans of the world to examine, it has only been a cup of water they have been able to check out. However, there is probably going to be a deeper analysis. MeerKAT, a series of 64 white antenna dishes, positioned nearly 400 miles to the northeast of Cape Town in South Africa, can check out the space more in-depth. Astronomers are hoping to carry out a survey of 1 million in the next five years, more so because of the supercomputer that has the potential to analyze the faintest electronic signal coming out from space. Detecting someone’s presence will be hopefully easier.
Sooner or later, researchers will be able to dive deeper and bring out concrete evidence regarding the existence of life beyond the neighborhood. Till then, you will have to wait if you really want to know if humans are alone in this universe.