Over the years people have gazed to the stars wondering if life was found somewhere other than planet Earth. Many suspected that aliens inhabited our galaxy; however, scientific studies always seemed to discard these ideas. With a recent turn of events, a new research conducted has shown that Earthlings may have been latecomers to a universe full of life and that aliens truly do exist.
Traditionally, astrobiologists, scientists interested in solving the mystery of the origin of life in the universe, study Goldilocks zones. Goldilocks zones are planets found in habitable zones around stars. But Abraham Loeb, a Harvard astrophysicist, has recently stated that exoplanets may have once had the ability to support life. Exoplanets are planets that orbit far beyond the habitable zone. Loeb states that the reason behind this is that these planets were warmed by the radiation left over from the Big Bang.
The Big Bang left sizzling plasma (superheated gas) causing the cosmos to be an extremely hot place. This plasma produced light known as the cosmic background radiation (CMB). It dates from around 389,000 years after the Big Bang and is still observed today.
As the universe expanded, the CMB gradually cooled down. As the cooling process was taking place, for about seven million years, the temperature was perfect for life to form (from 0 to 100 degrees Celsius). This temperature allowed water to remain liquid on ancient exoplanets.
Loeb states that “When the universe was 15 million years old, the cosmic microwave background had a temperature of a warm summer day on Earth,”. He goes on to explain that although some planets did not reside in the habitable zone around their parent star, the CMB could have kept their surface warm.
Although Loeb’s study seems reasonable, an important question still remains. It being; could planets have formed at such an early time?
The cosmological model states that the very first stars formed from hydrogen and helium tens of millions of years after the Bing Bang and that heavy elements necessary for planet formation did not exist yet. However, Loeb argues saying that rare “islands” packed with dense matter may have existed in the early universe...