Are there aliens ?
Our milkyway galaxy contains 100 billion stars. And our galaxy is one of 100 billion galaxies in the universe. And many of these stars have been in existence for billions of years. So if we were alone in the universe then the formation of life had to be a nearly impossible. 1) https://news.uchicago.edu/explainer/origin-life-earth-explained But so far scientists have found that unicellular life originated in the earth very early in its formation. The basic building blocks of life are RNA and DNA molecules. They are formed from combinations of amino acids. Samples of asteroid Ryugu returned to Earth by Japan’s Hayabusa2 mission, were found to contain more than 20 different amino acids. They have also been found in meteorite impacts on earth. Further a recent study in June 2022 2) https://phys.org/news/2022-06-scientists-breakthrough-life-earthand-mars.html found that RNA molecules can form easily in volcanic rocks in conditions. And given the tenacity of ...