Cepheid Variables — Topic Summaries
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Terence Tao continuing history’s cleverest cosmological measurements
Distance in astronomy isn’t measured directly so much as assembled—step by step—into a “cosmic distance ladder.” The central insight is that once one...
How We Know The Universe is Ancient
Astronomers can assign a precise “birthday” to the universe—about 13.8 billion years ago—even though no direct relic from the first moments survives....
Deciphering The Vast Scale of the Universe | STELLAR
The universe’s scale became measurable—and therefore believable—once astronomers could turn “fuzzy blobs” in the sky into objects with real...
2021 End of Year AMA!
The AMA’s biggest through-line is a push to treat quantum and astrophysics questions as solvable puzzles—then admit where the answers are still...