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Great Barrier Reef Suffers Worst Coral Decline on Record

3 months ago
Parts of the Great Barrier Reef have suffered the largest annual decline in coral cover since records began nearly 40 years ago, according to a new report. BBC: Northern and southern branches of the sprawling Australian reef both suffered their most widespread coral bleaching, the Australian Institute of Marine Science (AIMS) found. Reefs have been battered in recent months by tropical cyclones and outbreaks of crown-of-thorns starfish that feast on coral, but heat stress driven by climate change is the predominant reason, AIMS said. AIMS warns the habitat may reach a tipping point where coral cannot recover fast enough between catastrophic events and faces a "volatile" future. AIMS surveyed the health of 124 coral reefs between August 2024 and May 2025. It has been performing surveys since 1986. Often dubbed the world's largest living structure, the Great Barrier Reef is a 2,300km (1,429-mile) expanse of tropical corals that houses a stunning array of biodiversity. Repeated bleaching events are turning vast swaths of once-vibrant coral white. Australia's second largest reef, Ningaloo -- on Australia's western coast -- has also experienced repeated bleaching, and this year both major reefs simultaneously turned white for the first time ever. Coral is vital to the planet. Nicknamed the sea's architect, it builds vast structures that house an estimated 25% of all marine species.

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AWS wiped my account of 10 years, says open source dev

3 months ago
Cloud giant erased decade of work – denies it was due to botched dry run of user-pruning tool

Updated  An open source developer is claiming AWS deleted his ten-year-old account, wiping all the data. He believes this was due to a botched test of a script designed to prune dormant accounts.…

Dan Robinson

Astronomers Cannot Agree On How Fast the Universe is Expanding

3 months ago
Two fundamentally different methods for measuring the universe's expansion rate continue to produce incompatible results -- with direct observations of receding galaxies yielding approximately 73 kilometers per second per megaparsec and cosmic microwave background radiation analysis producing closer to 67 km/s/mpc. The discrepancy, known as the Hubble tension, has strengthened annually for the past decadem, according to Duke University astronomer Dan Scolnic. The persistent disagreement prevents calculation of the universe's precise age or size. The Lambda-CDM model, which holds that dark energy and dark matter comprise 95% of the universe while visible matter constitutes just 5%, assumes dark energy's nature has remained constant since the Big Bang. Some theorists propose dark energy's potency changes over time, while others suggest the Milky Way sits within a comparatively empty region of space. A June study using gravitational lensing of quasar light, bypassing traditional distance measurements, matched the higher value. New telescopes including the Vera Rubin Observatory and Nancy Grace Roman Space Telescope may provide additional data. Past improvements in measurement precision have only reinforced rather than resolved the tension.

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