Over the years there has been questions that people are asking if we are alone. Scientists have been seeking evidence of extraterrestrial life in the past half century. There have been many sightings of unidentified flying objects (UFOs) seen by the people around the world. Scientists states that intelligent extraterrestrial life almost certainly exists.
Are We Alone?
Life may had existed on Mars because it was a habitable world. In 2004, this discovery was made NASA's Opportunity rover at Eagle Crater that Mars had water. At the Martian surface there was liquid water, and if there was water that means that living organisms like bacteria, may have existed on Mars. Many scientists believe ...view middle of the document...
SETI (Search for Extraterrestrial Intelligence) is an international project employing with over hundred scientist that searches for extraterrestrial civilization. The SETI doesn't know what an alien signal will be like, they make some educated guesses how it will be like from their knowledge and technology. SETI thinks that the signal will be received at or frequency of 1420 MHz, to detect a strong signal. SETI believe that a signal received from such a society will testify to life's capacity for survival against long odds.
Scientists Wonder Why Alien Have Not Visited Us.
A young director of the Green Bank National Radio Astronomy Observatory in the USA name Frank Drake set up the first systematic search for extraterrestrial signals called Ozma. In 1960 it spent two months looking for radio signals in the directions of two nearby stars, Epsilon Eridani and Tau Ceti, which is twelve light years away from us. During this experience, they had zero results of extraterrestrial signals. In 1940, was the first sightings and reports of UFOs in the USA. In 1950, an Italian physicist Enrico Fermi had a discussion with his colleagues of civilization in our Galaxy. Fermi concludes that aliens already have visited, but had no evidence to prove this theory. In Fermi paradox also believes that the probability of appearance of intelligent life is weak because Earth is the only one in the Galaxy it occurred. Aliens don't seem to be walking our planet apparently implies that there are no extraterrestrials anywhere among the Galaxy.
Scientists Wonder Why No Aliens Civilizations Have Been Found.
In order to find extraterrestrial life, scientist needs telescopes that are capable to detect planets like Earth. This extraterrestrial planet needs to have a moon the size of Earth to support the atmosphere. Scientists announced that they found signatures of water in the atmospheres of five different hot planets where we won't able to survive. NASA's TESS (Transiting Exoplanet Survey Satellite) is an advance telescope that will search for exoplanets using a transiting method in 2017. Scientists believe it will take about ten years to find life. If...