The first glimmers of the observable universe and the traces of the first moments of creation have reached us. The Universe by definition contains everything that exists, including space-time, so it has no “edge”. Indeed, the existence of an edge would imply that beyond this edge, we would no longer be in the Universe, are we going to cross this observable limit?
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How can we say that the Universe has an age? 
First Proof of the Expansion of the Universe 
Space-time slices of the observable Universe 
Dark Ages of
the Universe 
Alternative theories to the accelerated expansion of the universe 
The primitive atom of Abbot Georges Lemaître 
Great walls and filaments: the great structures of the Universe 
Always closer to the Big Bang 
Lyman-alpha
bubbles 
The mystery of gamma bursts 
Eternal inflation, string theory and dark energy 
Planck's universe
The sky is immense with Laniakea 
Abundance of chemical elements in the Universe 
What is symmetry in the universe? 
The geometry
of time 
How to measure distances in the Universe? 
Do nothingness and emptiness exist? 
Mystery of the Big Bang, the problem of the horizon 
The first second of our history 
Does dark matter exist? 
Metaverse, the next stage of evolution 
The multiverse long before the Big Bang 
What is recombination in cosmology? 
The cosmological and physical constants of our Universe 
Thermodynamics of the sand pile 
What does the equation E=mc2 really mean? 
The engine of the accelerated expansion of the Universe 
The
Universe of X-rays 
The oldest galaxies in the universe 
Fossil radiation
in 1992 
Hubble constant and expansion of the Universe 
Dark energy
is needed 
Gravitational waves 
How
big is the universe? 
The vacuum has considerable energy 
Paradox of the dark night 
Paradoxes in physics