How do we know the age of Cosmic microwave background?
68684
Age of the CMB: How do we know?
36974
References for cosmological perturbation theory in the ADM formalism
25373
How do we know that some radioactive materials have a half life of millions or even billions of years?
58042
Redshifting of Light and the expansion of the universe
57039
Reference frame for the Cosmic Neutrino Background
136423
Python time to age
41812
Baryogenesis only at the Planck scale, or none at all?
55505
How can a quasar be 29 billion light-years away from Earth if Big Bang happened only 13.8 billion years ago?
71208
How to get Planck length
93336
Understanding time crystals
73729
Calculating the age of the Universe now and 30 billion years from now
26753
How long will the Universe's hydrogen reserves last for?
115517
How could we know that the relativistic curvature of universe is intrinsic?
9646
How is Doppler redshift of distant galaxies established?
157803
How the CMB anisotropy is linked to the existence of cold dark matter and dark energy?
81350
Is there a Cosmic Gravitational Background Radiation (CGBR)?
13269
How would we tell antimatter galaxies apart?