Cosmic Distance Ladder — Topic Summaries
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Terence Tao on the cosmic distance ladder
Humanity’s first “cosmic distance ladder” wasn’t built with rockets or lasers—it was built with geometry, shadows, and timing. The central...
The NEW Crisis in Cosmology
Cosmology’s “Hubble tension” has sharpened rather than softened: two high-precision ways of measuring the universe’s expansion rate still disagree,...
The Crisis in Cosmology
Cosmology is facing a direct, high-precision standoff over one number that ties the universe’s past to its future: the Hubble constant (H0), the...
Will Starshot's Insterstellar Journey Succeed?
Breakthrough Starshot aims to send swarms of gram-scale “nanocraft” to Alpha Centauri using laser-driven light sails, with the goal of returning...