After the Big Bang Planck time
13662
Did time exist before the Big Bang and the creation of the universe?
100972
Can someone explain Planck's constant simply?
43888
Age of universe?
129816
Experimental observation of matter/antimatter in the universe
80645
Time for two relativistic objects to meet
71342
Physical interpretation of the Reissner-Nordstrom metric
141546
Time and distance in a photon's frame of reference
47959
Is the collapse of the wave function inherently time asymmetric?
41812
Baryogenesis only at the Planck scale, or none at all?
93336
Understanding time crystals
143065
Fine Tuned Universe
143235
Twin Paradox, calculating spacetime intervals from both perspectives
107647
The uncertainty principle and black holes
6848
The strange thing about the maximum in Planck's law
98228
Evidence for quantum gravity from gravitational waves
75070
Will the CMB eventually recede outside our observable universe?
73729
Calculating the age of the Universe now and 30 billion years from now