The Doppler effect was extended from sound to light when astronomers noticed that starlight shifts in frequency, revealing stellar motion through subtle changes in color.
Good thinking isn’t just about asking big questions like the Fermi Paradox—it’s about recognizing the biases that shape our answers and staying open to possibilities far beyond our current understanding.
ΛCDM remains the leading cosmological model because our current best measurements indicate gravity is not strong enough to stop the universe’s expansion.
Astronomy
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