Astronomy timeline
27 milestones that trace major changes in how humanity understands the universe.
Medieval & Islamic astronomy
Al-Sufi publishes the Book of Fixed Stars
Al-Sufi publishes the Book of Fixed Stars
Renaissance revolution
Kepler publishes first two planetary laws
Kepler publishes first two planetary laws
Birth of astrophysics
Leavitt establishes Cepheid period–luminosity relation
Leavitt establishes Cepheid period–luminosity relation
Modern universe
Hubble establishes Andromeda as an external galaxy
Hubble establishes Andromeda as an external galaxy
Precision & multi-messenger era
COBE detects primordial CMB anisotropy
COBE detects primordial CMB anisotropy
Precision & multi-messenger era
Accelerating cosmic expansion reported
Accelerating cosmic expansion reported
Precision & multi-messenger era
First direct gravitational-wave detection
First direct gravitational-wave detection
Precision & multi-messenger era
GW170817 launches multi-messenger neutron-star astronomy
GW170817 launches multi-messenger neutron-star astronomy
Precision & multi-messenger era
JWST begins major science observations
JWST begins major science observations