They believe there is life on Mars, it is most likely bacteria. When regions of Mars experience their summer, there are spikes in CO2. This is best explained by life.
Tardigrades (space bears) can survive in the void of space, with all the difficulties including the extremely high UV which can scramble DNA.
Considering that the universe is approximately 14 billion years old, and our galaxy is 6 billion.
Therefore with size of the universe, the age of the universe and life existing outside our planet, it is not a far jump to intelligent life.
To quite the great Dr. Ian Malcolm, “life finds a way”.
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