That fraction multiplied by the initial number of stars, necessarily gives a result smaller than the initial number. Then he ignores the fact that not all stars have planets, then estimate the fraction of stars that have planetary systems. Quante stelle esistono nella Via Lattea ? This is the starting point. Ma in cosa consiste essenzialmente l’equazione di Drake ? Essa innanzitutto considera esclusivamente la nostra galassia, cioè la Via Lattea. La scienza è quindi sempre provvisoria e sempre in evoluzione, ma ha la fondamentale caratteristica di basarsi sull’osservazione. Se domani qualcuno elabora una teoria che è più aderente ai dati osservativi rispetto a quella attuale, la vecchia teoria viene immediatamente gettata nel cestino.
Chi ha fede crede senza bisogno di prove e continua comunque a credere invece lo scienziato fa affidamento sulle teorie attuali, che sono assolutamente falsificabili in qualunque momento. The big problem di fondo rimane lo stesso da millenni: la differenza fra scienza e fede. " In fact, they believe in the existence of extraterrestrial life: if science has not found yet, is because he has not tried in the right places, or not yet equipped with the necessary technological tools. " The classic question is more or less made me this way: "Excuse me, but apart from the fact that the universe is gigantic, and it is unacceptable that such a quantity of matter was created (or was created) only for us, there is also evidence in the Drake equation, according to which the likelihood of extraterrestrial life is nothing.
It happened also in Turin, at the end of the conference popularizing "The answers to the questions in science of astronomy," in which I presented the report: "It is easy to say probability (of extraterrestrial life and the asteroid impact). Not likely 'extraterrestrial life, BUT SIMPLE FREQUENCY ESTIMATES BASED ON UNCERTAINĪt many events, popular science, especially astronomy on the topic, the audience asked me questions on the equation of Frank Donald Drake.
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