https://www.vox.com/unexplainable/22547100/henrietta-leavitt-cosmic-ruler-podcast
How big is the universe? Henrietta Leavitt led Edwin Hubble to a better, bigger answer. | Vox
Jan 19, 2023 - Edwin Hubble’s name is everywhere in astronomy. Henrietta Leavitt’s should be too.
the universeedwin hubblebighenriettaleavitt