Extraterrestrial Life Quotes (22 quotes)
Stephen Hawking's Stark Warning for Humans to Leave Earth
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Panspermia hypotheses propose for example that microscopic life-forms that can survive the effects of space such as extremophiles can become trapped in debris ejected into space after collisions between planets and small Solar System bodies that harbor life. Under certain ideal impact circumstances into a body of water, for example , and ideal conditions on a new planet's surfaces, it is possible that the surviving organisms could become active and begin to colonize their new environment. Pseudo-panspermia sometimes called "soft panspermia" or "molecular panspermia" argues that the pre-biotic organic building-blocks of life originated in space, became incorporated in the solar nebula from which planets condensed, and were further—and continuously—distributed to planetary surfaces where life then emerged abiogenesis. Interstellar molecules are formed by chemical reactions within very sparse interstellar or circumstellar clouds of dust and gas. The chemistry leading to life may have begun shortly after the Big Bang, Though the presence of life is confirmed only on the Earth, some scientists think that extraterrestrial life is not only plausible, but probable or inevitable. Probes and instruments have started examining other planets and moons in the Solar System and in other planetary systems for evidence of having once supported simple life, and projects such as SETI attempt to detect radio transmissions from possible extraterrestrial civilizations.
Some sentences written by the British naturalist Darwin — in his publications or letters show his interest in this topic. But if and oh! Unable to display preview. Download preview PDF. Skip to main content. Advertisement Hide.
Connecting Science to You
This month, we present the following piece by PhD student Sonali Joshi. How life originated on earth is a question that people have pondered for ages. Theories abound, from those based on religious doctrine, to the purely scientific, to others that border on science fiction.
The mystery of how the building blocks of biology came to be on Earth may finally have been solved. As scientific mysteries go, this is the big one. How did life on Earth begin? Not how did life evolve, but how did it start in the first place? What was the initial spark that lit the fire of evolution?