Birth of Gold Hydride

 Scientists formed a new compound, accidentally proved that gold is a 'reactive metal'

In a high-pressure lab experiment, scientists accidentally created a new compound called gold hydride. Gold has always symbolised permanence and chemical calm. For centuries, scientists called it stubbornly unreactive. Now, a laboratory experiment has shattered that belief. Researchers have forced gold to react with hydrogen. The result is a never-before-seen compound called gold hydride. This discovery changes how scientists understand noble metals. This particular hydride formed when thin gold foil met dense hydrogen at pressures hundreds of thousands of times Earth’s atmosphere and blazing temperatures. The discovery challenges gold’s reputation as a nearly inert metal and shows how extreme conditions can push familiar materials into unfamiliar forms. By creating gold hydride in the lab, researchers opened a way to study dense hydrogen like that inside giant planets and fusing stars.

The experiment was led by Mungo Frost a staff scientist at Stanford Linear Accelerator Center(SLAC). They aimed to study hydrogen under extreme pressures. Gold was chosen as a stable, inert reference material. It usually acts as a passive X-ray absorber. Scientists expected gold to remain chemically silent throughout. No reaction was predicted or even considered possible. Then, unexpectedly, gold began interacting with hydrogen atoms. The “inert” metal refused to stay passive this time. A new compound formed, and scientists called it the first solid "gold hydride". What started as routine observation became groundbreaking discovery. Gold revealed a hidden chemical personality in extreme conditions. Gold was expected to remain inert during the experiment, since it is normally chemically unreactive. The accidental reaction produced the first confirmed solid compound made solely of gold and hydrogen atoms in any laboratory experiment. Under pressure and heat, hydrogen became superionic, a state where atoms move like a liquid inside a solid, making the gold hydride conductive. Hydrogen usually barely scatters X-rays, so the team watched changes in the gold lattice to deduce how the light atoms were moving. Simulations and measurements indicate that hydrogen diffuses rapidly through the hexagonal gold lattice at high temperature but separates when the sample cools. Interior models of Jupiter suggest a shell of metallic hydrogen surrounding a dense core, with pressures beyond anything on Earth’s surface. In those environments, hydrogen is compressed so tightly that it behaves more like a dense, electrically conducting fluid than a simple gas.

Recent research has shown that superionic states in silica water and silica hydrogen mixtures could help explain magnetic fields in giant planets. Gold hydride offers a controlled environment where dense hydrogen’s structure and motion can be measured, giving theorists a clearer target for planetary calculations. The discovery took place at Stanford Linear Accelerator Center (SLAC), California. The experiments focuses on matter under extreme pressures and temperatures. SLAC’s advanced facilities allowed the team to recreate these extreme conditions. It was here that gold defied expectations and formed gold hydride. Gold hydride joins a catalog of exotic phases, including superionic water and silica compounds, that appear only when atoms are squeezed and heated. Many of these phases vanish once pressure or temperature drops, yet their existence helps explain how planets move heat and generate magnetic fields. Because hydrides of other metals already show properties like superconductivity, understanding gold hydride could one day help design new electronic materials. Gold hydride’s appearance under stress shows that even familiar elements in lab samples can behave unexpectedly when scientists push conditions beyond normal experience.

Stars like the Sun shine because gravity squeezes hydrogen until nuclei fuse, and fusion researchers try to recreate conditions in experiments on Earth. Accurate models of dense hydrogen, hydrogen compressed to extraordinary pressures and densities, are vital for understanding fusion fuel behavior. Simulations indicate that even small uncertainties in hydrogen’s behavior at high-density can significantly change fusion predictions. By pinning how hydrogen moves through gold at given pressures and temperatures, the measurements give fusion modelers a benchmark to test their calculations. Gold belongs to the noble metals group. These elements are famous for chemical stubbornness. They rarely bond with other elements. This stability made gold useful and predictable. It also made scientists stop questioning its behaviour. But this experiment reopened a closed chapter. Under extreme pressure, gold’s electrons rearranged. New bonding pathways suddenly became possible, and scientists discover that gold is a 'reactive metal' by accidentally creating this new compound.

The experiment was originally designed to clock how long simple hydrocarbons take to turn into diamond under crushing pressure and searing heat. Researchers squeezed tiny drops of hydrocarbon between the tips of a diamond anvil cell, a device that traps samples at immense static pressures. Laser heating inside such cells lets scientists study materials at extreme pressures, as shown in a recent review of diamond anvil work. At the European XFEL in Germany, X-ray pulses hit a thin gold foil in the sample, which then heated the surrounding hydrocarbons. The team cranked the pressure until it rivaled Earth’s lower mantle, then blasted the sample with trains of X-ray pulses. Under those conditions, the study reports gold hydride forming at temperatures above 3,500 degrees Fahrenheit and at pressures far beyond Earth’s mantle. X-ray scattering patterns confirmed that carbon atoms snapped into the tidy lattice of diamond, matching what the researchers expected from earlier work. Signals in the data revealed hydrogen atoms entering the gold lattice, forming gold hydride that altered how the metal scattered X-rays.

In everyday chemistry, gold is grouped with the noble metals that rarely form compounds, which is why jewelry stays bright for decades. In these experiments, gold formed a hydride that held more hydrogen as pressure climbed, yet separated into plain gold again when conditions eased. The findings indicate that extreme pressure and heat can enable forms of chemistry that do not occur under normal conditions. High pressure work has shown unreactive elements like xenon can form compounds, so gold hydride underscores how chemistry changes when matter is squeezed. The experiments relied on the European XFEL, a powerful X-ray laser facility that delivers thousands of pulses each second to targets. Those pulses deposit energy in the gold foil, allowing scientists to heat the sample rapidly while the diamond-anvil cell maintains the pressure. High-energy-density science, the study of matter under extreme pressures and temperatures, uses intense X-ray lasers together with diamond anvil cells. As these tools improve, from tougher diamond anvils to brighter X-ray sources, researchers can probe states of matter once considered purely theoretical.

The study is published in the National Library of Medicine. Understanding gold’s reactivity changes fundamental science. It affects models of planetary interiors. It informs high-pressure material research. The discovery could influence fusion energy studies. Dense hydrogen behaviour remains poorly understood. Gold hydride offers a rare experimental window. It also reminds scientists to question assumptions. Even trusted facts can bend under pressure. The simulation framework that captured superionic hydrogen in gold can predict how other elements behave when infused with hydrogen at different pressures and temperatures. Future experiments can swap gold for other metals or mixtures that resemble planetary materials more closely, letting researchers test whether strange hydrides emerge. Each compound uncovered at such extremes expands the periodic table of high-pressure phases and clarifies how ordinary elements behave when pushed hard. If gold can react, what else can? Are other noble metals hiding secret chemistry Platinum and silver may hold similar surprises. Future experiments will push limits further. More unexpected reactions may soon appear. Gold’s secret reaction sends a powerful message. In science, certainty is always temporary.

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The flying snakes of Asia

 Asia’s Realm of Flying Snakes

What is the largest flying snake in the world? That's right. There are snakes that can fly, or at least they can glide impressively through the air. The Chrysopelea genus of snakes includes five species of "flying snakes." These snakes are found throughout Sri Lanka, south China, India, southeastern Asia, and the Greater and Lesser Sunda Islands. The flying snakes of Asia are truly remarkable creatures with a unique ability to maneuver between treetops. These snakes do not fly like winged creatures, instead launching themselves through the air to reach a new location. Although each species of flying snake has its own unique appearance, most flying snakes are green or a greenish-yellow color. Some species have additional colors and patterns, ranging from dark grey and black to bright red, yellow and orange. These colors often form crossbars and tiny speckles, or they can be shaped like flowers or flower petals running along the middle of the snake's back. Flying snakes are much more slender than other snake species, which helps them with their gliding abilities. The 5 species of flying snakes are the golden tree snake, the Moluccan flying snake, the paradise tree snake, the Sri Lankan flying snake and the banded flying snake.

The idea of a “flying snake” sounds like something out of mythology or science fiction. But in the forests of South and Southeast Asia, these remarkable reptiles are very real. Belonging to the genus Chrysopelea, flying snakes don’t truly fly in the way birds or bats do. Because they lack wings. Instead, flying snakes glide through the air with astonishing control, launching themselves from trees and maneuvering between branches with a movement which looks almost impossible. Their unusual relocating ability is only part of what makes them so fascinating. Flying snakes are also beautifully patterned and highly adapted to life in the treetops. Compared to other snake species, these arboreal reptiles are not widely understood. Based on what biologists have studies, these snakes are a striking example of how evolution can produce remarkable creatures. By flying or gliding from tree to tree, a flying snake can conserve the energy it would otherwise use climbing up and down trees and across the forest floor while it hunts for prey. In addition, flying snakes can avoid many of the predators which live on the ground. Although each species of flying snake has its own unique appearance, most flying snakes are green or a greenish-yellow color. Some species have additional colors and patterns. Despite their name, “flying snakes” do not actually fly, at least not in a traditional manner. Instead, these snakes launch themselves from branches and glide through the air to their destination. The backs of these snakes are smooth and glossy, but the scales on their bellies are ridged. Flying snakes climb vertically up trees by pressing and moving these texturized belly scales against the tree bark.

While in the air, flying snakes also twist their bodies back and forth in an undulating motion. This helps the snake to stabilize its direction while still in the air and control its landing. As strange as it may look, this undulating motion actually increases the snake’s gliding ability and aerodynamics, making it look as if it were effortlessly swimming through the sky. Some flying snakes have been observed gliding remarkable horizontal distances, but exact range and speed vary by species, launch height and conditions. When a flying snake wants to relocate, it will move out onto an extended branch and dangle its body down, holding onto the tree with only the end of its tail. As the snake hangs from the tree, it will form its body into a “J”-type shape and lean forward. The snake then throws its entire body out and away from the tree, catapulting into the air. As it soars through the air, the snake sucks in its stomach, flattening its body into a concave, wing-like shape by spreading its ribs. Like a flying disc, this concave, flattened shape creates air pressure under the snake’s body and propels it along, allowing the snake to fly or glide across long distances. A flying snake can glide as far as 330 feet and as fast as 26-33 feet/second through the air!

The largest flying snake is often cited as either the Moluccan flying snake (Chrysopelea rhodopleuron) or the golden tree snake (Chrysopelea ornata), depending on the source and measurement. Both can reach roughly 4 feet (about 120 cm). The Moluccan flying snake lives on Indonesia’s Sulawesi and Ambon islands. The golden tree snake (or ornate flying snake) has a thicker body than the other species of flying snakes, weakening its gliding ability. A golden tree snake certainly can still glide from tree to tree, but not nearly as well as many of the other smaller flying snakes. There are two main color patterns of the golden tree snake. The first, primarily found in southern India and Sri Lanka, has a pale green or a greenish-yellow colored body. Each of its green scales have a small black mark, and many have black outlines around the scale. The snake’s head is black with solid and broken yellow crossbars. Snakes in Sri Lanka sometimes have orange or reddish blotches along the middle of their backs as well, shaped like flowers. Golden tree snakes in Southeast Asia, on the other hand, do not have these spots. These snakes are often more of a bright green color with duller crossband patterns. The golden tree snake occurs across parts of South and Southeast Asia, including India, Sri Lanka, and parts of mainland and island Southeast Asia. Golden tree snakes often live in secondary or re-grown forests, although many have adapted quite well to more developed areas like rural gardens and plantations.

In some parts of their range, golden tree snakes may enter human structures such as roofs or garden buildings while hunting prey. They can scale vertical walls with ease and commonly hunt mice and geckos in and around the structures. Golden tree snakes commonly prey on lizards and other small vertebrates, and in some areas may take geckos, frogs, birds, bats or rodents. Chrysopelea, more commonly known as the flying snake or gliding snake, is a genus and belongs to the family Colubridae. These arboreal snakes are found across South and Southeast Asia, including India, Sri Lanka, southern China, and parts of the Indonesian archipelago. They inhabit trees, living among the branches and leaves, where they hunt for lizards, frogs and other small animals as their prey. The flying snake is an excellent climber due to its strong prehensile tails, which can be used to grip tree trunks or branches. They spread their ribs outward to flatten the body into a gliding airfoil-like shape. This body shape helps them glide efficiently between trees. There are different species of flying snakes:

Golden tree snake

Moluccan flying snake

Paradise tree snake

Sri Lankan flying snake

Banded flying snake

Paradise Tree Snake"

The paradise tree snake grows up to 3 feet in length. These snakes are popular in the European pet trade. The paradise tree snake is one of the best-known and best-studied flying snakes, though sightings still depend heavily on habitat and region. They can be found in Singapore, Thailand, Indonesia and Cambodia. This snake is often green and black, sometimes with red, orange, or yellow markings depending on locality and pattern variation. The paradise tree snake is the best glider of all five flying tree snake species. Chrysopelea, more commonly known as the flying snake or gliding snake, is a genus that belongs to the family Colubridae. They inhabit trees, living among the branches and leaves, where they hunt for lizards, frogs, and other small animals as their prey. The flying snake is an excellent climber due to its strong prehensile tails, which can be used to grip tree trunks or branches. They also have specially adapted ribs that allow them to flatten their bodies into a flattened diamond shape when gliding through the air from one tree to another. This enables them to glide distances up to 164 feet! The banded flying snake (Chrysopelea pelias) is generally regarded as the smallest species in the group. This small snake only grows up to 2 feet in length, half the size of the largest flying snake in the world. The banded flying snake has a reddish or dark gray body, with white or yellow, black, and red stripes.

Although the colors and patterns of the banded flying snake are easy to recognize, it is less commonly encountered than some of the other flying snakes. It lives in the humid forests of Singapore, Malaysia, and Indonesia. Because of their unique abilities and bright colors, flying snakes are becoming more popular for reptile collectors. Flying snakes are mildly venomous rear-fanged colubrids, but they are generally not considered dangerous to humans. However, these snakes can be stress-prone in captivity and may bite defensively when handled. Flying snakes are generally considered challenging to keep and breed in captivity due to their anxious nature. In addition, snakes caught in the wild often bring along many parasites when transferred to captivity. Researchers often look to nature for inspiration when designing new forms of robotics. A great example is the design of Snake Robots, which are patterned after the anatomy and movements of various snake species, including the flying snake. Snake robots are particularly useful in disaster relief and rescue missions. Researchers have explored snake-like robots for search-and-rescue, inspection, and potentially future medical applications. Many scientists are continually studying flying snakes’ anatomy and gliding techniques with the hope that this knowledge can further advance these serpentine robots and their abilities.

The largest flying snake in the world is the golden tree snake (or ornate flying snake), which can grow up to 4 feet in length! This snake has a thicker body than the other species of flying snakes, weakening its gliding ability. There are two main color patterns of the golden tree snake. The first, primarily found in southern India and Sri Lanka, has a pale green or a greenish-yellow colored body. Each of its green scales have a small black mark, and many have black outlines around the scale. Snakes in Sri Lanka sometimes have orange or reddish blotches along the middle of their backs as well, shaped like flowers. Golden tree snakes in Southeast Asia, on the other hand, do not have these spots. These snakes are often more of a bright green color with duller crossband patterns. Most of the golden tree snakes in the wild live in the western ghats and eastern ghats of India, but some also live in Vietnam, Myanmar, Indonesia, Sri Lanka and Thailand. Golden tree snakes often live in secondary or re-grown forests, although many have adapted quite well to more developed areas like rural gardens and plantations. Reports suggest that in southern Thailand golden tree snakes often live inside bungalows, hiding in the thatched roofing. They can scale the vertical walls with ease, and commonly hunt mice and geckos in and around the bungalow structures. The golden tree snake's favorite food is the Tokay Gecko, but they also eat lizards, frogs, rodents, birds, and bats.