Physics & Astronomy News

<p>Schematic view of a bubble implosion, which is an envisioned picture showing the whole main events integrated, i.e., laser illumination, hot electron spread, implosion, and proton flash. (credit/ M. Murakami)</p>
Laser-driven Implosion
Scientists have discovered a novel particle acceleration mechanism called ‘micro-bubble implosion’
<p>Owens Valley Solar Array (EOVSA)</p>
New Insights into Solar Flares
New insights into solar flares' explosive energy releases were released by the Owens Valley Solar Array (EOVSA)

<p>In this illustration, the grid in the background represents the computational lattice that theoretical physicists used to calculate a particle property known as nucleon axial coupling. This property determines how a W boson (white wavy line) interacts with one of the quarks in a neutron (large transparent sphere in foreground), emitting an electron (large arrow) and antineutrino (dotted arrow) in a process called beta decay. This process transforms the neutron into a proton (distant transparent sphere). (Credit: Evan Berkowitz/Jülich Research Center, Lawrence Livermore National Laboratory)</p>
Life and Death of a Neutron
Experiments that measure the lifetime of neutrons reveal a perplexing and unresolved discrepancy.
<p>Precision assembly and mechanical technician Ryan Wilkinson inspects MOMA during thermal vacuum testing at Goddard</p>

<p>Credits: NASA</p>
Looking for Signs Life on Mars
Scientists have created a tiny chemistry lab for a rover that will drill beneath the Martian surface looking for signs of past or present life.

Massive Black Hole Devours a Star
Scientist create new models of Tidal Disruption Events - rare, but extremely forceful events taking place in the center of galaxies.
Dark Matter Limit Established
Experimental results from the XENON1T dark matter detector limit the effective size of dark matter particles to 4.1X10-47 square centimeters.
Water is not the same as water
Researchers have succeeded in separating the two forms of water to show that they can exhibit different chemical reactivities.

Science Facts

Groups & Clusters of Galaxies

by Chandra X-Ray Observatory Center and

Hydra A is a galaxy cluster that is 840 million light years from Earth (redshift = .054). The cluster gets its name from the strong radio source, Hydra A, that originates in a galaxy near the center of the cluster.: Image Courtesy NASA/CXC/SAO Galaxy clusters are the largest gravitationally bound objects in the universe. They have three major components: (i) hundreds of galaxies containing stars, gas and dust; (ii) vast clouds of hot (30 - 100 million degrees Celsius) gas that is invisible to optical telescopes; and (iii) dark matter, a mysterious form of matter that has so far escaped direct detection with any type of telescope, but makes its presence felt through its gravitational pull on the galaxies and hot gas.

The hot gas envelops the galaxies and fills the space between galaxies. It contains more mass than all the galaxies in the cluster. Although the galaxies and hot gas clouds are very massive, scientists have determined that about 10 times more mass is needed to hold the cluster together. Something, namely dark matter must exist to provide the additional gravity.

Astronomers think that galaxy clusters form as clumps of dark matter and their associated galaxies are pulled together by gravity to form groups of dozens of galaxies, which in turn merge to form clusters of hundreds, and even thousands of galaxies. The gas in galaxy clusters is heated as the cluster is formed. This heating can be a violent process as gas clouds enveloping groups of galaxies collide and merge to become a cluster over billions of years.

Stopping In Thin Air

Imagine you're going very fast -- much faster than a race car. In fact, imagine you're going 100 or 200 times faster than a race car. When you reach your destination, you need to stop relatively quick ...
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Nuclides & Isotopes

An atom that has an unbalanced ratio of neutrons to protons in the nucleus seeks to become more stable. The unbalanced or unstable atom tries to become more stable by changing the number of neutrons a ...
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Global mosaic of 102 Viking 1 Orbiter images of Mars taken on orbit 1,334, 22 February 1980. The images are projected into point perspective, representing what a viewer would see from a spacecraft at an altitude of 2,500 km.
Exploring The 'Red Planet'

The planet Mars, sometimes called the 'Red Planet', has been an object of study for many centuries. The distinctive reddish color of the planet led some cultures to associate Mars with bloodshed and w ...
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Science Quote

'Nothing in this world is to be feared... only understood.'

Marie Curie

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