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Optical vortices—light beams carrying orbital angular momentum (OAM)—are characterized by helical wavefronts and phase singularities. While they have been widely studied in recent decades, two fundamental limitations have restricted their broader impact: generating large numbers of vortices simultaneously and achieving high peak power in such configurations. Until now, large vortex arrays have been limited to low-power systems, whereas high-power demonstrations have typically involved only single vortices.
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Drawing ever closer to Earth, the Artemis II astronauts tidied up their lunar cruiser for its upcoming “fireball” return and reflected on their historic journey around the moon, describing it as surreal and profound.
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On April 10, Artemis II—humanity’s first mission to the moon in more than half a century—will draw to a close when the Orion capsule carrying four crew members detaches from its service module.
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Class B; September 2009; British Columbia
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Reading the “Mars Trilogy” by Kim Stanley Robinson brings the benefits and pitfalls of efforts to terraform the red planet into sharp relief. Since the 1970s, when Carl Sagan first suggested the possibility that we could make Mars more Earth-like, that process has been a staple of science fiction. But there’s always been a significant amount of humanity that thinks we shouldn’t. A new paper posted to the arXiv preprint server by Edwin Kite of the University of Chicago and his co-authors skirts around the ethical and moral questions of whether we should and tries to take a long, hard look at whether we can.
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Former NYPD sergeant Erik Duran was convicted of manslaughter after throwing a cooler that caused the 2023 death of Eric Duprey
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After successfully completing their mission to the moon, the Artemis II crew are about to return to Earth.
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The closest planet to our sun, Mercury, experiences extreme temperature variations. Since the planet has no atmosphere to speak of, it is in a constant cycle where one side is extremely hot and the other extremely cold. On the sun-facing side, temperatures reach a scorching 427°C (800°F), enough to melt tin and lead, and the surface is exposed to extremely lethal levels of radiation. On the night side, temperatures plunge to a chilling −173°C (-279.4°F), cold enough to freeze most liquids, including those used in battery manufacturing.
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Drone footage shows the man raising a handgun and firing multiple shots at a responding Phoenix PD helicopter before officers returned fire on the ground
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Twin control rooms at NASA’s Marshall Space Flight Center in Huntsville, Alabama, are actively supporting real-time mission operations in lunar orbit as part of the agency’s Artemis II mission, helping ensure astronaut safety and mission success as the crew prepares to return to Earth Friday, April 10.
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Video shows multiple Woodbridge PD officers approaching the man, who was walking away while yelling and refusing to drop the bat; after several minutes, one officer fired shots
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The Paranal solar ESPRESSO Telescope (PoET), installed at the European Southern Observatory’s (ESO’s) Paranal site in Chile, has made its first observations. The telescope will work with ESO’s ESPRESSO instrument to study the sun in detail. Described as a solar telescope for planet hunters, PoET aims to understand how the variation in the light from stars like the sun can mask the presence of planets orbiting them, helping us in our search for worlds outside the solar system.
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Researchers have developed a new imaging technique that captures more information about ultrafast processes in the microscopic world than was previously possible. The technique offers scientists a powerful new tool to observe and analyze a wide range of ultrafast phenomena—which can happen in hundreds of femtoseconds—with unprecedented detail and speed. Writing in Optica, the researchers describe their new ultrafast imaging technique, called compressed spectral-temporal coherent modulation femtosecond imaging (CST-CMFI).
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A vehicle that was traveling south on a freeway lost control and crossed the center cable barrier, striking Trooper Vernon Brake’s vehicle as he was driving northbound
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David J. Silvester, a mathematics professor at the University of Manchester, has developed a novel machine-learning method to detect sudden changes in fluid behavior, improving speed and the cost of identifying these instabilities and overcoming one of the major obstacles faced when using machine learning to simulate physical systems. The findings are published in the Journal of Computational Physics.
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