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The Big Bang took place 13.8 billion years ago, the Solar System was formed 4.6 billion years ago, and the first hominids appeared 6 million years ago. Life on other planets may have started, evolved, given birth to extraterrestrial intelligences, and perhaps even faced a planetary extinction event millions or even billions of years ago.
On the other side of this are those scientists of the time who rejected Pasteur's results and instead supported the idea that life on Earth came from existing life. This necessarily requires that life has always existed somewhere on some planet, and that it has a mechanism of transferring between planets.
If life exists on other planets or moons it may be chemically similar, though it is also possible that there are organisms with quite different chemistries [3] – for instance, involving other classes of carbon compounds, compounds of another element, or another solvent in place of water.
The thin band between perpetual night and day, known as a termination zone, could have just the right ingredients for life to flourish. Alien Life May Exist in the Zone Between Night and Day ...
This is also called the habitable zone, when a planet is the right distance from its star to have a comfortable temperature and liquid water pooling on its surface. For possible life on other ...
“Asteroids provide a time capsule into our home planet’s history, and Bennu’s samples are pivotal in our understanding of what ingredients in our solar system existed before life started on ...
Early astrobiology research focused on the search for extraterrestrial life and the study of the potential for life to exist on other planets. [2] In the 1960s and 1970s, NASA began its astrobiology pursuits within the Viking program, which was the first US mission to land on Mars and search for signs of life. [4]
Life in the atmosphere brown dwarfs was also discussed by Yates et al. in 2017, and in 2019 Manasvi Lingam and Abraham Loeb extended the discussion of Yates et al.. Both articles extend the viability of Earth-like biological life beyond planets. [8] [9] Their ideas were criticized by experts in brown dwarfs. [10]