Physics & Astronomy News

<p>Illustration of how light is transformed into ALP by the galaxy. Credits to Aurore Simonnet, Sonoma State University (for the active galaxy core image) and NASA/NOAA/GSFC/Suomi NPP/VIIRS/Norman Kuring (for the image of earth).</p>
Dark matter does not contain certain axion-like particles
Researches are getting closer to corner light dark-matter particle models. Observations can rule out some axion-like particles in the quest for the content of dark matter.
<p>Harmonic oscillator device - Credits: LENS. Florence, Italy /SEM, Trento, Italy</p>
The Universe, where space - time becomes discrete
It time continuous or discrete? Scientists propose a non-local union of relativity and quantum mechanics.

<p>ORNL researchers discovered that water in beryl displays some unique and unexpected characteristics. (Photo by Jeff Scovil)</p>
New state of water molecule discovered
Researchers have discovered a new state of water molecule using neutron scattering & computational modeling.
<p>A schematic of the CSU team’s device that demonstrates using light to create a spin current. A spin voltage drives spin-up and spin-down electrons to move in opposite directions, resulting in a pure spin current across a platinum layer.</p>
A brand-new way to produce electron spin currents
For the first time, scientists have used non-polarized light to produce what’s called a spin voltage – a unit of power produced from the quantum spinning of an individual electron.

Mars surface revealed in unprecedented detail
The surface of Mars – including the location of Beagle-2 – has been shown in unprecedented detail by scientists using a revolutionary image stacking and matching technique.
Team builds first quantum cascade laser on silicon
The advance may have applications that span from chemical bond spectroscopy and gas sensing, to astronomy and free-space communications.
A New Way To Get Electricity From Magnetism
By showing that a phenomenon dubbed the “inverse spin Hall effect” works in several organic semiconductors – including carbon-60 buckyballs - physicists changed magnetic “spin current” into electric current.

Science Facts

Live Fast, Blow Hard, and Die Young

by NASA Headquarters and

NASA Massive stars lead short, yet spectacular lives. And, they usually do not go quietly, instead often blowing themselves apart in supernova explosions. Astronomers are curious about the details of the final steps before these violent endings. A new image gives astronomers a look at this critical period of one massive star's life and imminent death. NASA's Chandra X-ray Observatory data (blue) and optical observations (green and red) reveal the region around a doomed massive star called HD 192163. This star is surrounded by a giant gaseous shell, known as the Crescent Nebula, which has been created by powerful winds blowing from HD 192163.

How did the star get to this stage? After only 4.5 million years (one-thousandth the age of the Sun), HD 192163 began its headlong rush toward a supernova catastrophe. First, it expanded enormously to become a red giant and ejected its outer layers at about 20,000 miles per hour. Two hundred thousand years later -- a blink of the eye in the life of a normal star -- the intense radiation from the exposed hot, inner layer of the star began pushing gas away at speeds in excess of 3 million miles per hour!

When this high-speed 'stellar wind' rammed into the slower red giant wind, a dense shell was formed. In the image, a portion of the shell is shown in red. The force of the collision created two shock waves: one that moved outward from the dense shell to create the green filamentary structure, and one that moved inward to produce a bubble of million-degree Celsius X-ray-emitting gas (blue). The brightest X-ray emission is near the densest part of the compressed shell of gas, indicating that the hot gas is evaporating matter from the shell. HD 192163 will likely explode as a supernova in about 100,000 years. This image enables astronomers to determine the mass, energy, and composition of the gaseous shell around this pre-supernova star. An understanding of such environments provides important data for interpreting observations of supernovas and their remnants.

An artist
The Brave and Cold Ulysses

Deep space is cold. Very cold. That's a problem--especially if you're flying in an old spaceship. And your power supplies are waning. And the fuel lines could freeze at any moment. Oh, and by the way, ...
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The diagram at right shows the changes in the rate of expansion since the universe
Dark Energy Changes the Universe

Dark energy has the cosmoslogists scratching their heads. Observations taken by NASA's Hubble Space Telescope and future space telescopes will be needed in order to determine the properties of dark en ...
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Mach 1: Fast planes and Ernst Mach
How Fast is Mach 1?

A Mach number is a common ratio unit of speed when one is talking about aircrafts. By definition, the Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed ...
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Science Quote

'There is no inductive method which could lead to the fundamental concepts of physics. Failure to understand this fact constituted the basic philosophical error of so many investigators of the nineteenth century.'

Albert Einstein

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