Peter Ward + Donald Brownlee
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Two scientists argued that alien microbes might be everywhere, but creatures like us are almost a cosmic fluke.
Who they are
Peter Ward, a paleontologist, and Donald Brownlee, an astronomer, co-authors of the 2000 book Rare Earth.
What they do
The engine uses them for the idea that simple life may be common but complex life is extremely rare.
How it works
In Rare Earth they argued that basic microbial life could be widespread across the universe, but complex multicellular life requires an unlikely stacking of rare planetary conditions all coming together.
Why it matters
Their thesis frames Earth's advanced life as a statistical anomaly, a key reference point in debates about how alone we might be.
The engine's record — word for word
Paleontologist (Ward) + astronomer (Brownlee). Co-authors of Rare Earth: Why Complex Life Is Uncommon in the Universe (2000). Argued that simple microbial life may be common but complex multicellular life requires statistically aberrant cumulative planetary anomalies.
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