Are we alone in the universe?
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The Fermi paradox, the answers on offer, where the telescopes are looking, and how tough life on Earth turned out to be.
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The argument
Where to look
How tough life is
False alarms and maybes
Your claim, not verified
If life starts easily, a galaxy this old should be full of it, and we should have seen signs by now.
Contested
The Fermi Paradox
Hypothesis
The Drake Equation
Hypothesis
The Great Filter
Hypothesis
The Rare Earth Hypothesis
Hypothesis
The Zoo Hypothesis
Hypothesis
The Dyson Sphere
Proven
Exoplanets
Fact
The Habitable Zone
Fact
Biosignatures
Fact
The James Webb Space Telescope
Fact
Mars
Contested
Interstellar Objects
Fact
Extremophiles
Fact
Tardigrade
Hypothesis
Abiogenesis: The Origin of Life
Hypothesis
The Alkaline Vent Hypothesis
Hypothesis
Panspermia
Fact
The Water Cycle
Contested
The Wow! Signal
Debunked
The Martian Canals
Question
Is the filter behind us, at the start of life, or ahead of us?
Question
What single observation would settle the question?
Thousands of planets have been confirmed around other stars since the first finds in the 1990s. Many sit in their star's habitable zone.