Two possibilities exist: either we are alone in the Universe or we are not.
All What you Need To Know About The Universe: ARE WE ALONE ?
INTRODUCTION
Definition-
Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. While the spatial size of the entire Universe is still unknown, it is possible to measure the observable universe.
The Universe is often defined as “the totality of existence”, or everything that exists, everything that has existed, and everything that will exist. In fact, some philosophers and scientists support the inclusion of ideas and abstract concepts – such as mathematics and logic – in the definition of the Universe. The word universe may also refer to concepts such as the cosmos, the world, and nature.
For More Info-https://en.wikipedia.org/wiki/Universe
Etymology-
The word universe derives from the Old French word univers, which in turn derives from the Latin word universum. The Latin word was used by Cicero and later Latin authors in many of the same senses as the modern English word is used.
For The Meanings And Synonym Visit-https://en.oxforddictionaries.com/
The Big Bang-
The prevailing model for the evolution of the Universe is the Big Bang theory. The Big Bang model states that the earliest state of the Universe was an extremely hot and dense one, and that the Universe subsequently expanded and cooled. The model is based on general relativity and on simplifying assumptions such as homogeneity and isotropic of space. A version of the model with a cosmological constant (Lambda) and cold dark matter, known as the Lambda-CDM model, is the simplest model that provides a reasonably good account of various observations about the Universe. The Big Bang model accounts for observations such as the correlation of distance and red shift of galaxies, the ratio of the number of hydrogen to helium atoms, and the microwave radiation background.
Big Bang
Main Idea – ( Are We Alone In The universe ? )
SETI
The scientific search for extraterrestrial (ET) life has been in full swing for a long time. Since the founding of the SETI (“search for extraterrestrial intelligence”) Institute in 1984, the idea that we might actually be able to contact or detect intelligent alien beings has worked its way into the popular consciousness. But despite hundreds of millions of dollars invested into various approaches to validate the belief that ET life is out there somewhere, there is still no proof.
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K.Al Hashmi 