New chip-scale gyroscope measures rotation with unprecedented sensitivity - Phys.org
Researchers developed an integrated Brillouin laser ring gyroscope that measures rotation as slow as 37 degrees per hour. This image shows a conceptual schematic of the chip-based gyroscope. Researchers have developed a chip-scale optical ring-laser gyroscope that can measure rotation as slow as 37 degrees per hour. This record sensitivity, approaching Earth's rotation rate of 15 degrees per hour, could eventually be useful for precision navigation and orientation systems, particularly where GPS is unavailable. Gyroscopes measure how an object rotates, helping determine its orientation and movement.
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Earth’s rotation is notoriously wobbly. It could alter the fate of the leap second - CP24
Published: October 13, 2026 at 12:17p.m. EDTLONDON -- When the sun hits its highest point over the meridian line that travels north and south from the 351-year-old Royal Observatory Greenwich in London, it’s noon Greenwich Mean Time, a tangible and physical reference point that helped establish the world’s time zone system. Timekeeping has long relied on Earth’s spin and location of the sun or moon in the sky. Before observatories such as Greenwich, humans used sundials — essentially a stick in the ground that casts shadows as the sun moves overhead. But this ancient link between Mother Earth and today’s clocks looks set to be severed. International timekeepers are on track to vote Thursday on a proposal to eliminate what’s known as a leap second — a tiny, but many say important, link between Earth’s rotation and the world’s time standard used in critical infrastructure such as telecommunications, power grids and computers.
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Lone, starless cloud may be a 'dark' galaxy - Phys.org
H I column-density map of J1351+0039 from the FAST observation shown in blue contours overlaid on the DESI RGB (g,r,z) image. Credit: Jin-Long Xu et al., arXiv (2026). DOI: 10.48550/arXiv.2609.29852 Astronomers using China's FAST radio telescope have discovered a compact cloud of hydrogen with no visible stars or galaxy around it. This could be one of the strongest candidates yet for an isolated "dark galaxy," containing nearly 500,000 times the sun's mass in neutral hydrogen. The discovery paper was posted to the arXiv preprint server on Sept. 24.
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