These microwaves were produced when the Universe became transparent, 400 000 years after the Big Bang (simulation : results expected from the Planck satellite).
We now know that we observe but a small fraction of the Universe’s content. What are its main building blocks? Dark matter, dark energy, the fate of primordial antimatter are at the core of this research.
last update : 02-07 00:00:00-2005 (546)
In the Big Bang theory, matter and antimatter appeared in equal proportions at the very beginning of the Universe. Particles and antiparticles mutually annihilated each other, but one billionth of the baryons subsisted to form the matter of ... More »
Recent cosmological measurements have revealed that the expansion of the Universe is undergoing acceleration. This phenomenon, referred to as ‘Dark Energy’, poses one of the most pressing questions in fundamental physics. The Megacam ... More »