X-Rays Can Echo and Bend Around the Back of Supermassive Black Holes
We have now seen echoes of X-ray bursts from behind a black hole, confirming a prediction of general relativity.
New Scientist
Topics: Black Holes Galaxies Gravity Relativity
Supermassive Black Holes May Be Formed By Collapsing Dark Matter Halos
The theory may help to explain the presence of supermassive black holes in the early Universe.
BBC Science Focus Magazine
Topics: Black Holes Dark Matter Gravity
How a Weird Theory of Gravity Could Break Cause-and-Effect
Could modified theories of gravity explain bizarre behavior of galaxies and even the universe as a whole?
Live Science
Topics: Dark Matter Galaxies Gravity Universe
Could Something Missing in the Universe Be Revealed by Ripples in Spacetime?
New research suggests that gravitational waves could help figure out more about the mysterious dark energy thought to be lurking in the void.
SYFY Wire
Topics: Dark Energy Gravitational Waves Gravity Universe
Dark Matter Holds Our Universe Together. No One Knows What It Is
Dark matter, unexplained.
Unexplainable, Vox
To Explain Away Dark Matter, Gravity Would Have to Be Really Weird, Cosmologists Say
Analysis of early cosmic evolution points to dark matter’s importance and casts doubt on modified theories of gravity.
Science
The Most Famous Paradox in Physics Nears Its End
In a landmark series of calculations, physicists have proved that black holes can shed information, which seems impossible by definition. The work appears to resolve a paradox that Stephen Hawking first described five decades ago.
Quanta Magazine
Topics: Black Holes Entanglement Gravity Quantum Gravity Quantum Mechanics String Theory
An Earlier Universe Existed Before the Big Bang, and Can Still Be Observed Today, Says Nobel Winner
Sir Roger Penrose: “The Big Bang was not the beginning. There was something before, and that something is what we will have in our future.”
The Telegraph
Topics: Big Bang Black Holes Gravity Relativity Universe
One of Quantum Physics’ Greatest Paradoxes May Have Lost Its Leading Explanation
Underground experiment undermines gravity as the cause of quantum collapse.
Topics: Gravity Particles Quantum Mechanics Superposition
An Alternative to Dark Matter Passes Critical Test
Modified gravity theories have never been able to describe the universe’s first light. A new formulation does.
Does Dark Matter Exist?
Dark matter is the most ubiquitous thing physicists have never found: it’s time to consider alternative explanations.
Aeon
Star’s Strange Path Around Black Hole Proves Einstein Right — Again
Albert Einstein’s theory of general relativity has aced another test.
Topics: Black Holes Gravity Relativity Stars
‘Einstein’s Biggest Blunder’ May Have Finally Been Fixed
The cosmological constant has plagued physicists for more than a century.
Topics: Dark Energy Gravity Multiverse Relativity Universe
A Star Orbiting in the Extreme Gravity of a Black Hole Validates General Relativity
The star S0-2 gets so close to the supermassive black hole at the center of the galaxy that it can be used to test our fundamental understanding of gravity.
Smithsonian
Alternative Theory of Gravity Makes a Nearly Testable Prediction
A massive simulation done with a “chameleon” theory of gravity.
Ars Technica
Topics: Dark Energy Dark Matter Galaxies Gravity Relativity Stars Universe
Brian Greene on the First-Ever Image of a Black Hole From the Event Horizon Telescope
Scientists from the Event Horizon Telescope announced a result that will change our understanding of the universe: the first-ever image of a black hole’s event horizon, the point at which light can no longer escape the black hole’s gravitational pull.
World Science Festival
Topics: Black Holes Gravitational Waves Gravity
Gravity’s Residue
An unusual approach to unifying the laws of physics could solve Hawking’s black-hole information paradox — and its predicted gravitational “memory effect” could be picked up by LIGO.
FQXi
Topics: Black Holes Gravity Relativity
Maybe Dark Matter Is All Just a Big Mistake
Mystery one: what is dark matter. Mystery two: how to unify physics. Are they the same mystery?
Nautilus
Topics: Dark Energy Dark Matter Galaxies Gravity Quantum Gravity
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