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Do site da BBC:

Number of alien worlds quantified

Intelligent civilisations are out there and there could be thousands of them, according to an Edinburgh scientist.
The discovery of more than 330 planets outside our solar system in recent years has helped refine the number of life forms that are likely to exist.
The current research estimates that there are at least 361 intelligent civilisations in our Galaxy and possibly as many as 38,000.
The work is reported in the International Journal of Astrobiology

Um outro artigo da BBC fala de um trabalho que joga um balde de água fria na possibilidade de fazermos um chat com outra raça inteligente, porém:

“”We now believe that we evolved late in the Earth’s habitable period, and this suggests that our evolution is rather unlikely. In fact, the timing of events is consistent with it being very rare indeed,” he says.

“This has implications for our understanding of the likelihood of complex life and intelligence arising on any given planet.”

‘Billion years left’

Models of future global temperature suggest that, due to the increasing solar luminosity, the future life span of Earth will be “only” about another billion years – a short time compared to the four billion years since life first appeared on the planet.

Previous models are founded on the rationale that intelligent life on Earth emerged from a sequence of unlikely “critical steps”.

Prof Watson identifies four – the emergence of single-celled bacteria; complex cells; specialised cells allowing complex life forms; intelligent life with an established language.

He estimates that the probability of each of these “critical steps” occurring in relation to the lifespan of Earth is no more than 10%.


Diante disso, é hora de quizz.

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