Greenwood Police Officer D.J. Keller was a United States Army and National Guard veteran who served with the Greenwood Police Department for three years
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Greenwood Police Officer D.J. Keller was a United States Army and National Guard veteran who served with the Greenwood Police Department for three years
NASA’s Perseverance Mars rover recently took a self-portrait against a sweeping backdrop of ancient Martian terrain at a location the science team calls Lac de Charmes. Assembled from 61 individual images, the selfie shows Perseverance training its mast on a rocky outcrop on which it had just made a circular abrasion patch, with the western rim of Jezero Crater stretching into the background. The selfie was captured on March 11, the 1,797th Martian day (sol) of the mission, during the rover’s deepest push west beyond the crater.
Cornell astronomers are deploying a new instrument that grants them, for the first time, a better view of the universe’s earliest galaxies, which can’t be observed individually with traditional ground- or space-based telescopes.
The galaxy cluster Abell 2029 is sometimes described as “the most relaxed cluster in the universe.” This moniker does not arise from some sort of mellow vibe, but rather because of how calm and undisturbed the superheated gas that pervades the cluster appears to be.
Simulating the nonlinear optical physics that underlies ultrafast laser systems is computationally demanding—a practical bottleneck in settings that require rapid feedback. A study by researchers at Stanford University, University of California, Los Angeles (UCLA), and SLAC National Accelerator Laboratory introduces a deep learning surrogate that delivers orders-of-magnitude acceleration over conventional simulation methods, while maintaining high fidelity across a challenging range of pulse shapes.
Dark matter is thought to make up most of the matter in the universe, but the only way it interacts with its surroundings is through gravity. If two colliding black holes spiral through a dense region of dark matter and merge, gravitational waves rippling across space and time could carry an imprint of that dark matter.
Researchers at The University of Osaka, in collaboration with Ritsumeikan University, have demonstrated that growing europium-doped gallium nitride (Eu-doped GaN) on a semipolar crystal plane dramatically improves red light emission. The team found that this approach selectively promotes the formation of highly efficient Eu luminescent centers, resulting in red emission intensity more than 3.6 times higher than that of conventionally grown polar-plane material.
Matter behaves strangely under extreme conditions, and often, remnants of these behaviors are left behind even when conditions return to normal. The Trinity nuclear test in 1945 left behind such remnants, and now, 80 years after the explosion, researchers have identified another unique example of what happens when various materials are heated to temperatures exceeding 1,500 °C (2,730 °F) and put under pressures tens of thousands of times atmospheric pressure.
Quantum computers could someday solve pressing problems that are too convoluted for classical computers, such as modeling complex molecular interactions to streamline drug discovery and materials development.
‘He wanted us to kill him’: Former Ala. deputy holds wife, baby hostage before fatally shooting selfMacon County Sheriff Andre Brunson was able to negotiate the safe release of the hostages just moments before the shooting
A new AI-based approach that can “hear” inside the sun could give vital signs of the solar disturbances that have significant effects in near-Earth space and on human activities. The solar cycle is an approximate 11-year period during which the sun’s magnetic activity rises and falls. The cycle begins relatively calmly. However, as it progresses, the magnetic field becomes more aggressive, leading to a surge in sunspot numbers, solar flares, and coronal mass ejections. These eruptions can disrupt satellites and power grids and thus have a direct impact on our communication technology.
President Donald Trump said his administration has prioritized public safety and supported tougher penalties for those who kill police officers
By analyzing the data from the Whole Earth Blazar Telescope (WEBT), an international team of astronomers has discovered optical quasi-periodic oscillation (QPO) in a bright quasar known as 3C 454.3. It is so far one of the most persistent QPOs detected in the optical band. The finding was reported in a paper published April 30 on the arXiv pre-print server.
Scientists at the University of Science and Technology of China have successfully deployed a multi-mode quantum relay network, achieving matter–matter entanglement over 14.5 kilometers, according to media reports.
The Marine veteran and a Massachusetts State Police Trooper shot the suspect in the extremities, stopping him from firing shots in the middle of Cambridge’s Memorial Drive
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