In his famous lecture, “Life in the Universe”, Stephen Hawking asks: “What are the chances that we will encounter some alien form of life, as we explore the galaxy?” If the argument about the time scale for the appearance of life on Earth is correct, Hawking says “there ought to be many other stars, whose planets have life on them.
Life on Earth may have its origins in outer space. NASA’s Scientists have analysed meteorites that formed billions of years ago before falling to Earth. The carbon-rich fragments were found to contain chemicals similar to one of the key components of DNA, the building blocks of life.
Some of the world’s leading astronomers — including Great Britain’s astronomer royal, Sir Martin Rees — believe aliens, rather than using different radio waves or visible light to signal, may be using an entirely different communication medium such as ghostly neutrinos or with gravitational waves (ripples in the fabric of space-time) or using communication mechanisms we cannot begin to fathom.