Concepts of Time:
The equations of time
Timelapse of the future
The days are getting longer
A defense of the reality of time
A look into the fourth dimension
Bell's theorm for temporal order
Timelapse of the entire universe
Carlo Rovelli on the physics of time
Physicists find signs of a time crystal
Keeping time with highly charged ions
Einstein says: It's 309.7-meter o'clock
Testing Einstein's E=mc2 in outer space
BoBar experiment confirms time asymmetry
FOAM: the importance of time synchronization
Inquiry into the nature of time with A. H. Almaas
Forget everything you think you know about time
The new thermodynamic understanding of clocks
A rock is a clock: physicist uses matter to tell time
Perfectly accurate clocks turn out to be impossible
In a 'rainbow' universe time may have no beginning
Light from galaxy clusters confirm theory of relativity
Physics explains why time passes faster as you age
Cosmic triangles open a window to the origin of time
The most accurate optical single-ion clock worldwide
The simple idea behind Eistein's greatest discoveries
Eva Silvastein: Other observations on history of science
Paradigm shift offers a new look at the beginning of time
Leap second: French time lords add one second to 2015
An inexpensive crystal makes a fine quantum time machine
Researchers explain why the Greenwich prime meridian moved
Superradiant laser may boost atomic clocks, create 'rulers' for sp
Scientists create time crystals, a rule-bending new form of matter
The discrete-time physics hiding inside our continuous-time world
The history of time and frequency from antiquity to the present day
1400km of optical fibre connect optical clocks in France and Germany
Quantum paradox experiment may lead to more accurate clocks and sensors
Does time really flow? New clues come freom a century-old approach to math
Gravity:
Teleparallel gravity
How fast is gravity?
Testing theories of modified gravity
Why gravity is not like the other forces
The long path to understanding gravity
Emergent gravity and the dark universe
Maybe 'dark matter' doesn't exist after all
How gravity is a double copy of other forces
A molecular clock for testing fundamental forces
New math bridges holography and twistor theory
Gravity recovery and climate experiment (GRACE)
Attractive force arises from black-body radiation, says physicists
Strategy for the International Gravity Reference System and Frame IGRS/IGRF
Development of a displacement sensor to measure gravity of smallest source mass ever
A simple view of gravity does not fully explain the distribution of stars in crowded clusters
High-resolution data demonstrate gravitational lensing of the cosmic microwave background
Testing the strong equivalence principle: detection of external field effect in rotationally supported galaxies
Quantum Gravity:
Quantum gravity limits from planet observations
How holography could help solve quantum gravity
Researchers find quantum gravity has no symmetry
Physicists find a way to see the 'grin' of quantum gravity
One lab's quest to build space-time out of quantum particles
Understanding how quantum gravity affects low-energy physics
An ultra-precise clock shows how to link the quantum world with gravity
Understanding of complex networks could help unify gravity and quantum mechanics
Physical Units , weights, measures and constants:
Just a moment
What is a light-year?
Our relative velocities
Political union through science
The sounds of weights and measures
The future of the kilo: a weighty matter
Universal units reflect their Earthly origins
A more fundamental International System of Units
Galileo, krypton, and how the Metric Standard came to be
Largest overhaul of scientific units since 1875 wins approval
Important milestone reached on road to a redefined kilogram
An atomic physics perspective on the kilogram's new definition
New measurement of Universe's expansion rate is 'stuck in the middle'
Gravitational constant appears universally constant, pulsar study suggests
Kilogram to be based on physical absolute instead of single, physical object
Space-Time:
Planck results 2013
A wrinkle in space-time
Space-time vortex around Earth
Simulating extreme space-times
Spacetime has no time dimension
Cosmography of the local Universe
The fall and rise of the Doppler Effect
What is the geometry of the Universe?
The century of the cosmological constant
A new study suggests we've got it all wrong
Spacetime: a smoother brew than we knew
New discovery about the fabric of space-time
How our Universe could emerge as a hologram
How spacetime is built by quantum entanglement
New mathrmatical model links space-time theories
Superfluid turbulence through the lens of black holes
Astronomers discover new way to measure Universe
Bringing time, space together for universal symmetry
Simulating four-dimensional physics in the laboratory
First signs of weird quantum property of empty space
Shape from sound - new methods to probe the Universe
Symmetries reveal clues about the holographic Universe
Scientists discover a jewel at the heart of quantum physics
Quantum computer as detector shows space is not squeezed
How space and time could be a quantum error-correcting code
Is nature continuous or discrete? How the atomist error was born
Is it possible to travel the span of the Universe at the speed of light?
International collaboration replicates amplification of cosmic magnetic fields
A robust constraint on cosmic textures from the cosmic microwave background
Maximum and minimum values, cosmology, a conjecture and Beckenstein bound
NASA's gravity probe spacecraft confirms Einstein's 'Warping of spacetime & frame-dragging'
Dimension:
Powers of Ten
Topology 101: the hole truth
The journey to define dimension
Lasers and ultracold atoms for a changing Earth
Structure in the fabric of space - the African Arrow
How many numbers exist? Infinity proof moves math closer to an answer
Strategy for the realisation of the International Height Reference System (IHRS)
Why our universe was born with 3 dimensions: a puzzle of superstring theory solved by supercomputer
Time Crystals:
Space-time crystals on the horizon
Space-time crystals of trapped ions
Time crystals realize new order of space-time
Eternal change for no energy: a time crystal finally made real
Expansion of the Universe:
What is the Universe expanding into?
Universe expanding faster than expected
Expansion of space measurement improved
Big bounce simulations challenge the Big Bang
Cosmologists debate how fast the Universe is expanding
Universe's expansion may not be the same in all directions
How (relatively) simple symmetries underlie our expanding universe
Could gravitational waves reveal how fast our universe is expanding?
The universe's rate of expansion is in dispute - and we may need new physics to solve it
Worm-holes:
Inside the big wormhole
Magnetic wormhole created for the first time
Travel through wormholes is possible, but slow
Newfound wormhole allows information to escape black holes
How to tell the shape of a wormhole by its quasinormal modes
'Spooky action' builds a wormhole between 'entangled' particles
Wormholes reveal a way to manipulate black hole information in the lab
Energy:
Boosting of force from empty space
Quantum vacuum: less than zero energy
Entropy:
How Maxwell's Demon continues to startle scientists
String Theory:
Visualizing 11-dimensions
Making sense of String Theory
String Theory: a simple way to understand the universe
Some physicists see signs of cosmic strings from the Big Bang
Alternative Models of the Universe:
Recipe for a universe
How the Universe works
Caught in the cosmic web
Reinterpreting dark matter
The scale of the Universe 2
How order arises in the cosmos
Is the Universe a bubble? Let's check
Misconceptions about the Universe
Beyond the horizon of the Universe
How we escaped from the Big Bang
Universe is older than previously thought
Getting the math of the Universe to cancel out
Collapse of the Universe is closer than ever before
Planck mission explores the history of our Universe
Estimating cosmological parametters from the dark matter distribution
Paradoxes of cosmological physics in the beginning of the 21st Century
New findings bring physicists closer to understanding the formation of planets and stars
Multi-verse:
Many universes, many theories
Could a multiverse be hospitable to life?
Physicists study how our Universes might bubble up and collide
Experimental limits on neutron disappearance into another braneworld
We are one of a vast Universe of new universes constantly being created
Scientists are searching for a mirror universe: it could besitting right in front of you
Hologramic Universe:
Are we Living in a hologram?
The Universe is really a hologram, according to new simulations
Light in a spin
A new Einstein Ring
Sounds from space emr
Dead star warps light of red star
Quest to test Einstein's speed limit
Special relativity induced by granular space
A better understanding of how the Sun bends light
Researchers shine a light on 150-year old mystery
Teaching general relativity to undergraduates
Precise test confirms speed of light is constant
Extending Einstein's theory beyond light speed
Speed of light: the history of a physical constant
A journey of light through space and time (video)
5-dimensional black hole could 'break' general relativity
Bizarre binary star system pushes study of relativity to new limits
Scientists discover how to turn light into matter after 80-year quest
Left-handed cosmic magnetic field could explain missing antimatter
Researchers develop way to control speed of light, send it backwards
First successful test of Einstein's General Relativity near supermassive black hole
Simulation shows that dark energy and matter can reproduce the Universe
Flashes from faster-than-light spots may help illuminate astronomical secrets
NIST pair of aluminum atomic clocks reveal Eistein's relativity at a personal scale
Transfer of atomic mass with a photon solves the momentum paradox of light
Newly discovered 3-star system to challenge Einstein's theory of General Relativity
Can strongly lensed Type 1a supernovae resolve one of cosmologies biggest controversies?
A heavy weight for Einstein: observations of the most massive neutron star confirms Eistein's theory
Detection of the cosmic gamma ray horizon measures all the light in the universe since the Big Bang
Theory of Everything (ToE):