The question of whether Earth is the first place where intelligent life existed in our entire galaxy is highly speculative and currently beyond the scope of scientific consensus. The topic of extraterrestrial life is an active area of research and exploration, but no definitive evidence of intelligent life beyond Earth has been discovered.
Given the vast number of stars and planets in the Milky Way galaxy, it is statistically plausible that life may have evolved elsewhere. The Drake Equation, a tool used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way, takes into account factors such as the rate of star formation, the fraction of stars with planets, and the probability of life emerging on suitable planets. However, the values assigned to these factors are highly uncertain, leading to a wide range of possible outcomes.
It is important to note that the discovery of even microbial life beyond Earth would have profound implications for our understanding of the universe and the potential prevalence of life. However, until we have concrete evidence, the question of whether Earth is the first place where intelligent life emerged remains speculative. Future scientific advancements and exploration missions may provide more insights into this fascinating question.