Henrietta Leavitt and Cepheid standard candles Astronomers Henrietta Swan Leavitt: Measuring the Universe (2026) Henrietta Swan Leavitt discovered how to measure cosmic distances. Her period-luminosity law let astronomers size the universe — the key to Hubble's work.
Vera Rubin and dark matter Astronomers Vera Rubin: The Astronomer Who Proved Dark Matter (2026) Vera Rubin found the first solid evidence for dark matter by measuring how galaxies rotate. The astronomer who revealed the universe's hidden mass.
Hypatia of Alexandria astronomy and mathematics Astronomers Hypatia of Alexandria: Astronomer and Mathematician Hypatia of Alexandria was a brilliant mathematician and astronomer who led the Neoplatonic school. Her life, work, and tragic death in Roman Egypt, explained.
Cecilia Payne-Gaposchkin Astronomers Cecilia Payne-Gaposchkin: The Essential 1925 Stellar Breakthrough In 1925 Cecilia Payne-Gaposchkin discovered stars are made mostly of hydrogen and helium — one of astronomy's greatest, long-overlooked breakthroughs.
