杏吧原创

Gravity

3D illustration of a wormhole or Einstein?Rosen bridge is a hypothetical topological feature that would be a shortcut connecting

Space

Wormholes could magnify light by a factor of 100,000

Wormholes, which are strange hypothetical tunnels through space-time, could act as cosmic magnifying glasses for objects behind them

News
This image shows the Hyades star cluster, the nearest cluster to us. The Hyades cluster is very well studied due to its location, but previous searches for planets have produced only one. A new study led by Jay Farihi of the University of Cambridge, UK, has now found the atmospheres of two burnt-out stars in this cluster ??? known as white dwarfs ??? to be ???polluted??? by rocky debris circling the star. Seeing evidence of asteroids points to the possibility of Earth-sized planets in the same system, as asteroids are the building blocks of major planets. Planet-forming processes are inefficient, and spawn many times more small bodies than large bodies ??? but once rocky embryos the size of asteroids are built, planets are sure to follow.

Space

Crooked star clusters may be a sign that Einstein鈥檚 gravity is wrong

News
Magnetic fields in NGC 1068, or M77, are shown as streamlines over a visible light and X-ray composite image of the galaxy from the Hubble Space Telescope, the Nuclear Spectroscopic Array, and the Sloan Digital Sky Survey. The magnetic fields align along the entire length of the massive spiral arms ? 24,000 light years across (0.8 kiloparsecs) ? implying that the gravitational forces that created the galaxy?s shape are also compressing its magnetic field. This supports the leading theory of how the spiral arms are forced into their iconic shape known as ?density wave theory.? SOFIA studied the galaxy using far-infrared light (89 microns) to reveal facets of its magnetic fields that previous observations using visible and radio telescopes could not detect. Credits: NASA/SOFIA; NASA/JPL-Caltech/Roma Tre Univ. https://www.nasa.gov/feature/how-to-shape-a-spiral-galaxy

Space

Did magnetism shape the universe? An epic experiment suggests it did

Features
CNES Satellite Illustration

Physics

Einstein’s gravity principle still correct, finds most precise test

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Space

How you can get involved with the hunt for gravitational waves

Regulars

Physics

Can Einstein鈥檚 forgotten theory of space solve the cosmology crisis?

Features
KRJ9F0 Quantum-Gravity-Photon-Race

Physics

Why is it so difficult to find a viable quantum theory of gravity?

Features

Physics

Merging galaxies throw shade on alternative dark matter theory

News

Physics

Physicists have measured gravity on the smallest scale ever

News

Physics

We may have to rewrite our understanding of gravity

There is a mismatch between two ways of measuring galactic mass. Dark matter is one way to solve it, but so is rewriting the laws of gravity, says Chanda Prescod-Weinstein

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Physics

A warp drive that doesn’t break the laws of physics is possible

News

Science with Sam: What is a black hole? And could you survive one?

Video

Physics

Odd space circles show we are far from running out of cosmic puzzles

News

Physics

What does gravity weigh? The surprise answer that reshapes reality

Features