JWST researchers reported on measurements built on last year's confirmation based on Webb data that Hubble's measurements of ...

New observations from the James Webb Space Telescope have reinforced the Hubble tension, a discrepancy between different ...

Leavitt discovered 2,400 variable stars, about half of the known total in her day. Through these discoveries came her most important contribution to the field: the study of cepheid variable stars ...

Leavitt's work with variable stars led to her most important contribution to the field: the cepheid variable period-luminosity relationship. By intense observation of a certain class of variable ...