If life is common, it suggests that the universe is "pregnant" with possibility. It offers a sense of cosmic belonging. Conversely, if we find evidence of ancient, extinct civilizations (technosignatures), it serves as a sobering reminder of the fragility of our own existence and the importance of preserving our planet. The Paradox: If They Exist, Where Are They?
Our Milky Way galaxy contains between 100 billion and 400 billion stars. Even if life is a freak occurrence—a chemical accident with a one-in-a-million chance—that still leaves hundreds of thousands of life-bearing worlds in our galaxy alone. But the galaxy is just a speck. The observable universe contains an estimated two trillion galaxies. That is two trillion islands of stars, each with their own potential for biology. We Are Not Alone
There are dozens of proposed solutions to this silence, each fascinating in its own right. If life is common, it suggests that the
If “We Are Not Alone” is a fact, then our ethical systems are obsolete. Traditional ethics (Kantian, Utilitarian) are anthropocentric, focusing only on human rational agents. A post-solipsistic ethics requires three shifts: The Paradox: If They Exist, Where Are They
When we say "We Are Not Alone," we must first acknowledge the neighbors we have already found. In the last fifty years, we have discovered life on Earth in places science deemed impossible.
If the numbers provide the real estate, the discovery of "extremophiles" on Earth provides the blueprint for how life could survive elsewhere.