Astronomy
The Fermi Paradox
The Fermi Paradox — why a vast universe has not yielded clear signs of alien civilizations, key hypotheses and what science says today.
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Astronomy
Stars, galaxies, cosmology and what science actually knows about the cosmos.
Astronomy
The Wow! Signal: Astronomy's Most Famous Mystery
The 1977 Wow! signal — Ohio State Big Ear detection, 1420 MHz hydrogen line, non-repetition and what SETI researchers conclude today.
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Astronomy
The Drake Equation Explained
The Drake equation — factors for estimating communicative civilizations, uncertainties, SETI context and relation to the Fermi paradox.
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Astronomy
'Oumuamua: Interstellar Object and UFO Speculation
'Oumuamua (1I/2017 U1) — first known interstellar visitor, unusual acceleration, scientific models and hedged UFO speculation.
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Astronomy
Astronomical Unit (AU): Definition and Uses
Astronomical unit explained — definition, distance from Earth to the Sun, AU vs light-year and how astronomers use it in solar-system and SETI context.
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