Il est peut-être temps de dire au revoir au Big Bang. Des cosmologistes pensent que l’Univers s’est formé à partir de débris éjectés lorsqu’une étoile à 4 dimensions s’est effondrée en trou noir, un scénario qui expliquerait pourquoi le cosmos semble être uniforme dans toutes les directions.
The first Earth-sized exoplanet orbiting within the habitable zone of another star has been confirmed by observations with both the W. M. Keck Observatory and the Gemini Observatory. The initial discovery, made by NASA's Kepler Space Telescope, is one of a handful of smaller planets found by Kepler and verified using large ground-based telescopes. It also confirms that Earth-sized planets do exist in the habitable zone of other stars.
You may have heard that CERN announced the discovery of a strange particle known as Z(4430). A paper summarizing the results has been published on the physics arxiv, which is a repository for preprint (not yet peer reviewed) physics papers. The new particle is about 4 times more massive than a proton, has a negative charge,…
SCIENCE - Elle est partout, tout en étant invisible, alors a-t-on vraiment "vu" de la matière noire? Rien n'est encore certain mais une équipe de chercheurs américains pense que cela pourrait être le cas.
L’annonce de la détection d’une exoplanète pratiquement de la même taille que la Terre, située à une distance de son étoile qui pourrait lui permettre d’abriter de l’eau sous forme liquide, constitue un pas de plus vers la découverte d’une jumelle de notre planète.
We take for granted that we exist as 3-D beings in a 3-D universe, but physicists suggest that our world is just the projection of a reality written in 2-D. Scientific American editor Michael Moyer explains. Video credits - Production assistants: Kathryn Free & William Herkewitz, produced by Eric R. Olson
On March 17, 2014, a group of physicists announced a thrilling discovery: the “smoking gun” data for the idea of an inflationary universe, a clue to the Big Bang. For non-physicists, what does it mean? TED asked Allan Adams to briefly explain the results, in this improvised talk illustrated by Randall Munroe of xkcd.
The first direct evidence of cosmic inflation — a rapid period of expansion that occurred a fraction of a second after the Big Bang — could also help support the idea that this universe exists in a multiverse, scientists suggest.
The universe has long captivated us with its immense scales of distance and time. How far does it stretch? Where does it end, and what lies beyond its star fields and streams of galaxies extending as far as telescopes can see? These questions are beginning to yield to a series of extraordinary new lines of investigation and technologies that are letting us to peer into the most distant realms of the cosmos. But also at the behavior of matter and energy on the smallest of scales. Remarkably, our growing understanding of this kingdom of the ultra-tiny, inside the nuclei of atoms, permits us to glimpse the largest vistas of space and time. - See more at: http://www.sciencegymnasium.com/2013/07/how-large-is-universe.html#sthash.13Mzn8gk.dpuf