It happened at least once, on earth, so it could probably happen again somewhere else.
It’s probably very unlikely, but the universe is such a big place that is could happen somewhere. It would be incredibly exciting if we discovered some.
One thing we have learnt from life on Earth is that it will survive in almost any circumstances. This especially applies to bacterial life. There are some bacteria that can survive nuclear blasts and a journey into space.
It seems likely that if a planet has conditions which will support some kind of life, then life will exist. I think the most important thing is the temperature of the planet, it must not be too cold or else chemicals reactions would be too slow. We may not recognise it easily but I think that life could be all over the Universe.
There is lots of evidence that tlife began on this planet with no interference (although it depends on your views of how the world was created).
Scientists believe planets need to be within a “Goldilocks Zone” of their solar system. This is where the planet if neither too close or too far away from its sun, so it is niether too hot or too cold – Just like the Earth!
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