The Earth formed around 4.5 billion years ago.
Doing the math (13.8 - 4.5 = 9.3), the universe existed for about 9.3 billion years before Earth arrived.
That means roughly 67% of cosmic history had already passed by the time our planet was born.
The earliest undisputed evidence of microbial life on Earth dates about 3.5-3.7 billion years ago.
The Milky Way is just one local drop in the ocean. There are an estimated 2 trillion galaxies in the observable universe.
When you multiply billions of habitable planets per galaxy by trillions of galaxies, the sheer probability of life existing elsewhere seems almost certain.
When you multiply billions of habitable planets per galaxy by trillions of galaxies, the sheer probability of life existing elsewhere seems almost certain.
It took roughly 4 billion years for that primitive microbial life on Earth to evolve into intelligent, technologically advanced civilization.
In the Milky Way alone, there are an estimated 100 billion to 400 billion stars. Roughly 10% to 20% of them are sun-like (G-type stars), meaning there are tens of billions of solar cousins out there.
Current estimates suggest that a significant fraction of those sun-like stars host planets in the "Goldilocks zone" where liquid water can exist. We are talking billions of potentially habitable planets in our galaxy alone.
In the Milky Way alone, there are an estimated 100 billion to 400 billion stars. Roughly 10% to 20% of them are sun-like (G-type stars), meaning there are tens of billions of solar cousins out there.
Current estimates suggest that a significant fraction of those sun-like stars host planets in the "Goldilocks zone" where liquid water can exist. We are talking billions of potentially habitable planets in our galaxy alone.
Conclusion: The chances that intelligent life predating Earth by billions of years exists in the universe are extremely high.
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