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The inspiration for their theory isn't just an explanation for the Big Bang our Universe experienced 13.7 billion years ago, but lies in an attempt to explain one of the largest mysteries in physics - why time seems to move in one direction. The laws that govern physics on a microscopic scale are completely reversible, and yet, "no one gets confused about which is yesterday and which is tomorrow". Physicists have long blamed...


 philosophy space time physics universe cosmology Big Bang
It might not look like much, but this image represents one of the most distant objects astronomers have ever seen, 12.9 billion light years away. It is a "Lyman-alpha blob" and is 55,000 light years across - as large as present-day galaxies...


 cosmology galaxy astronomy astrophysics
Entangled... What if electrons were not really elementary, but were formed at the ends of long "strings" of other, fundamental particles? ... Could the entire universe be modelled in a similar way?...


 liquid quantum string cosmology physics universe
US scientists have reported the detection of signals that could indicate the presence of dark matter.


 dark matter universe cosmology physics
US-based physics experiment has found a clue as to why the world around us is composed of normal matter and not its shadowy opposite: anti-matter.


 anti-matter cosmology physics
In a mathematically perfect universe, we would be less than dead; we would never have existed. According to the basic precepts of Einsteinian relativity and quantum mechanics, equal amounts of matter and antimatter should have been created in the Big Bang and then immediately annihilated each other in a blaze of lethal energy.


 cosmology antimatter matter philosophy Big Bang annihilation physics
The basic constants of nature aren't called constants for nothing. Physics is supposed to work the same way across the universe and over all of time. Now measurements of the radio spectra of a distant gas cloud hint that some fundamental quantities might not be fixed after all, raising the possibility that a radical rethink of the standard model of particle physics may one day be needed...


 constant physics alpha time cosmology
There may be multiple versions of the elusive "God particle" - or Higgs boson - according to a new study...


 Higgs boson cosmology antimatter mass physics LHC
The "theory of everything" is one of the most cherished dreams of science. If it is ever discovered, it will describe the workings of the universe at the most fundamental level and thus encompass our entire understanding of nature. It would also answer such enduring puzzles as what dark matter is, the reason time flows in only one direction and how gravity works. Small wonder that Stephen Hawking famously said that such a theory...


 physics universe theory mathematics cosmology relativity truth nature
Scientists have made their most accurate measurement yet of the mass of a mysterious neutrino particle. ... A neutrino is capable of passing through a light-year (about six trillion miles) of lead without hitting a single atom.


 neutrino physics astronomy cosmology
Protons, among the building blocks of atoms, are even smaller than we thought—and the unexpected discovery may alter some of the most trusted laws of physics.


 physics proton size light cosmology
The oldest of the subatomic particles called neutrinos might each encompass a space larger than thousands of galaxies, new simulations suggest.


 neutrino physics cosmology size