Free Republic

How time travel could work: Scientists have uncovered a way to send messages into the past Time machines may seem better suited to science fiction than the physics lab, but experts say this futuristic technology could become a reality. Researchers have revealed how time travel could really work by using the laws of quantum physics. While their method won't let you hop back to the time of the dinosaurs, scientists say it could be possible to send messages into the past. The researchers even say this mind–bending technique would work just like in Christopher Nolan's sci–fi epic, Interstellar. In the...

A team of astronomers in Japan has detected a thin atmosphere around (612533) 2002 XV93, a trans-Neptunian object about 500 km in diameter — an object far too small and cold to retain one. An artist’s conception of the trans-Neptunian object 2002 XV93. Image credit: NAOJ. “In the cold reaches of the outer Solar System lie thousands of small objects known as trans-Neptunian objects (TNOs) because they lie outside the orbit of Neptune,” said Dr. Ko Arimatsu from Ishigakijima Astronomical Observatory and colleagues. “A thin atmosphere has been observed around Pluto, the most famous TNO, but studies of other TNOs...

Uranus in near-infrared. Image credit: NASA, ESA, CSA, STScI The rings of Uranus were only discovered in 1977 and the outer rings, named for the Greek letters μ and ν (mu and nu), have been a nice puzzle. First of all, they are different colors, with ν being redder and μ being bluer. This already hints at a difference in composition. New research now suggests a different origin for the two altogether. Researchers have combined observations from JWST, Hubble, and the Keck Observatory to better understand what these rings are made of and where they come from. “By decoding the...

Explanation: The 16th century Portuguese navigator Ferdinand Magellan and his crew had plenty of time to study the southern sky during the first circumnavigation of planet Earth. As a result, two fuzzy cloud-like objects easily visible to southern hemisphere skygazers are known as the Clouds of Magellan, now understood to be satellite galaxies of our much larger, spiral Milky Way galaxy. About 160,000 light-years distant in the constellation Dorado, the Large Magellanic Cloud is seen in this sharp galaxy portrait. Spanning about 15,000 light-years or so, it is the most massive of the Milky Way's satellite galaxies and is the...

Explanation: What is the Small Magellanic Cloud? It has turned out to be a galaxy. People who have wondered about this little fuzzy patch in the southern sky included Portuguese navigator Ferdinand Magellan and his crew, who had plenty of time to study the unfamiliar night sky of the south during the first circumnavigation of planet Earth in the early 1500s. As a result, two celestial wonders easily visible for southern hemisphere skygazers are now known in Western culture as the Clouds of Magellan. Within the past 100 years, research has shown that these cosmic clouds are dwarf irregular galaxies,...

The fifth mirror for the GMT's 7 segment primary mirror is being cast at the Richard F. Caris Mirror Laboratory at the University of Arizona. In this image, a worker at the lab places the last piece of glass for mirror 5. Image: Giant Magellan Telescope Organization Astronomy, News, Observatories They Just Began Casting the Giant Magellan Telescope’s 5th Mirror. What a Monster Job. Article written: 7 Nov , 2017 by Evan Gough The fifth mirror for the Giant Magellan Telescope (GMT) is now being cast, according to an announcement from the Giant Magellan Telescope Organization (GMTO), the body...

Anthropic just published a study mapping exactly which jobs its own AI is replacing right now. The workers most at risk are not who anyone expected. They are older. They are more educated. They earn 47% more than average. And they are nearly four times more likely to hold a graduate degree than the workers AI is not touching. The argument is straightforward. Anthropic built a new metric called "observed exposure." Not what AI could theoretically do. What it is actually doing right now in professional settings, measured against millions of real Claude conversations from enterprise users. For computer and...

Both eruptions came from a sunspot region on the sun's western limb, AR4419. The first solar flare peaked at 9:07 p.m. EDT on April 23 (0107 GMT April 24), followed by the second at 4:14 a.m. EDT (0814 GMT) on April 24. These are the strongest solar flares we've seen in 78 days, according to solar physicist Ryan French. The bursts of radiation from the flares triggered strong radio blackouts on the sunlit side of Earth — the first affecting parts of the Pacific Ocean and Australia and the second impacting East Asia. The active sunspot region is putting on...

It was more than it was Kraken-ed up to be. An octopus the size of the Hollywood Sign might seem like a monster from Greek mythology. However, new fossil evidence reveals that massive “kraken”-like cephalopods ruled the seas during the Cretaceous period, possibly preying on massive sea reptiles and other so-called apex predators, per a study published Thursday in the American Association for the Advancement of Science. This massive mollusk “had among the largest body sizes of all organisms in the Cretaceous oceans,” wrote the researchers, who hailed from Hokkaido University. Indeed, at 62-feet-long, this colossal octopus could grow up...

With all the excitement over sending scientists back to the moon, it’s easy to forget we’ve already got a pair of talented chemists on Mars: the Curiosity and Perseverance rovers. Although they beam back plenty of breathtaking images, these two robots are more than just cameras on wheels. Their primary mission is to search for signs of ancient life, and they’re equipped with a suite of onboard scientific instruments and chemical reagents to carry that mission out. Now, new research published in Nature Communications details Curiosity’s latest find—never-before-seen organic compounds, including one with a structure similar to DNA precursors. “We...

This innovative gel can be quickly applied to teeth in much the same way as standard fluoride treatments. Unlike traditional products, it contains no fluoride. Instead, it is made from proteins that imitate those naturally responsible for guiding enamel formation early in life.Once applied, the gel forms a thin yet durable layer that seeps into the surface of the teeth, filling in tiny cracks and holes. It then acts as a scaffold that captures calcium and phosphate ions from saliva. These minerals are carefully organized into new enamel through a process known as epitaxial mineralization. This allows the regenerated enamel...

51 years ago, India marked a historic milestone with the launch of Aryabhata, its first step into space. But long before the satellite lifted off aboard a Soviet rocket, its story had already begun in an unlikely place: a small church by the Arabian Sea. In the early 1960s, India’s fledgling space programme, what would later become the Indian Space Research Organisation, was operating with limited resources but boundless ambition. Under the leadership of Vikram Sarabhai, scientists were searching for a location close to the magnetic equator to study the upper atmosphere. They found it in Thumba, a quiet fishing...

Japanese authorities are warning that a second tsunami may be on the way after a 7.5 magnitude earthquake struck off the country's north-east coast

The Messinian Salinity Crisis / Zanclean Flood. Scientists Found Evidence Of The Biggest Event In Earth's History | 17:28 Thoughty2 | 25.68M subscribers | 971,176 views | November 17, 2025

It’s the end of the world as we know it — a lot sooner than we think. A team of researchers have drastically scaled back the going estimate of how long it will be until the universe ceases to exist. Previously, scientists believed it would be 10¹¹⁰⁰ years until the very last objects in the cosmos would disappear forever — that’s a 1 followed by 1,100 zeroes, in layman’s terms. But a new study published in the Journal of Cosmology and Astroparticle Physics by a trio of researchers at Radboud University in the Netherlands posits the real figure as closer...

Garcia allegedly served as a property custodian at KCNSC's New Mexico facility, giving him a top security clearance and broad access to the entire site's nuclear secrets. The source described Garcia's work as 'a very high-level, overseeing position for all the assets. Tens, maybe hundreds of millions of dollars in equipment and assets, some of which are not classified, others would be classified.' The government contractor's sudden disappearance marks the tenth person with ties to America's space or nuclear secrets who has died or mysteriously vanished in recent years, putting US national security experts on edge.

A simple experiment in a child’s swimming pool allows you to visualize the angular momentum of rotating waves. Beautifully done.

It may seem surprising that researchers could study a phenomenon for which we don’t yet have any data—after all, there are no verified accounts of conversations with aliens. But there are good reasons to consider what alien languages might look like. For one... human languages have far more in common than we might think. A universal grammar underlies what turn out to be mostly surface differences. [A]ll languages use a finite number of sounds (or gestures in the case of signed languages) and phrase types (like noun phrases and verb phrases) to build a theoretically limitless number of unique communications,...

Lunar Starship (the Starship Human Landing System, or HLS, for NASA's Artemis program) is in active development but remains several years from its first crewed lunar landing. As of early April 2026, the program has made substantial progress on hardware testing and subsystem qualification, yet key challenges like in-orbit propellant transfer, long-duration flights, and an uncrewed lunar demonstration are still ahead—contributing to schedule delays. Current Status and Major Achievements SpaceX has completed 49 contractual milestones for the HLS contract with NASA (out of many total), with most achieved on or ahead of schedule. These cover: Life support and thermal control...

Near-Earth asteroid Apophis is a potentially hazardous asteroid that will safely pass close to Earth on April 13, 2029. It will come about 20,000 miles (32,000 kilometers) from our planet’s surface — closer than the distance of many satellites in geosynchronous orbit (about 22,236 miles, or 36,000 kilometers, in altitude).