Keith Cooper - Time appeared to move 5 times more slowly in 1st billion years after Big Bang, quasar 'clocks' reveal:

https://www.space.com/quasar-clocks-universe-time-dilation

#TimeDilation #Timekeeping #Time #BlackHoles #QuasarClock #Clock #Quasars #Redshift #GeneralRelativity #Relativity #Astrophysics #Cosmology

Ingrid Fadelli - A highly precise terahertz molecular clock:

https://phys.org/news/2023-04-highly-precise-terahertz-molecular-clock.html

#AtomicClock #MolecularClock #Clock #Strontium #Sr2 #Terahertz #VibrationalModes #LASERs #Supercooling #Spectroscopy #Physics