Titanium in Cosmic Rays
In the stream of cosmic rays, particles flying toward us from the depths of the Galaxy, titanium is rare. Its nuclei are almost indistinguishable from iron: both are heavy, and both leave similar tracks in detectors.
Cosmic nuclei reveal their energies
High above the Antarctic ice sheet, a balloon with a detector floated for twenty days. It caught tiny particles that had been traveling toward us for millions of years from distant stellar explosions. Now scientists have sorted through the catch and reported how much energy the protons and nuclei of different elements carried.
Extra Electrons in Cosmic Rays
High above Antarctica, a balloon carried an instrument that caught electrons from space. These particles come from distant stellar explosions and other powerful events. The instrument measured their energy, like the force of an impact. And in one energy range, there were more impacts than calculations predicted.
The Twentieth Century's Two-Step Climate Shift
Ocean temperatures did not rise like water filling a bathtub; they rose like a person climbing stairs: two broad steps upward, with waves of natural variability lapping around them, advancing and retreating. The first step occurred in 1925/26, the second in 1987/88.
Cosmic Rays in Bubbles: Why Heavy Nuclei Unexpectedly Rise with Energy
The ATIC balloon rose over Antarctica and caught particles older than Earth itself. Among them are atomic nuclei from sulfur to chromium, and the higher their energy, the larger their fraction compared to iron. The standard 'leaky box' model predicted the opposite: heavy nuclei should dissolve like salt in water. But the data stubbornly rose.
Climate Moves in Steps, Not a Steady Climb
A kitchen thermometer doesn't creep upward gradually when you turn on the stove: first it stays put for a while, then suddenly jumps a few degrees. According to researchers' calculations, global temperature behaved much the same way from 1950 to 2013.
Cosmic Rays Break a Simple Law
High above Earth, a satellite flies, and inside it is an instrument the size of a small wardrobe. It catches particles that have been racing through the galaxy for billions of years and finally slam into the detector. Such particles are called cosmic rays, and they bring news of distant stellar explosions.
Cosmic Nuclei: What They Tell Us About Their Stars
Like long-distance runners, atomic nuclei, from light helium to heavy iron, race toward us across the Galaxy. At the finish line, in a detector on a high-altitude balloon, we see that heavy nuclei arrive a bit more exhausted than light ones. The difference is small, but it repeats from flight to flight.
The Cosmic Ray Knee: All Nuclei Break the Same Way
Cosmic rays are charged particles that fly to us from the depths of the Galaxy. If you plot how many particles arrive at each energy, the line runs smooth, then suddenly drops sharply.
A Thermometer That Hears India's Pulse
The thermometer at a weather station in Delhi doesn't know it's part of a giant ear. Every day it records the temperature, and after forty years of such records, you can hear the breathing of an entire subcontinent. The India Meteorological Department divided the country's land into one-degree squares and took readings from 1970 to 2009.
Climate as a Layered Cake: Continents, Zones, and Seasons in the 20th Century
A baker puts a layered cake in the oven: the dough is the same, the heat is the same, but each layer bakes differently. The thin crust on top is already browning, while the middle is still underdone. Earth's climate is similar: the planet is warming, but different parts of it are warming at different rates and at different times.
Cosmic Showers Reveal the Composition of Cosmic Rays
At night over the Siberian taiga, a faint blue light sometimes flickers. It's not the aurora borealis but a cosmic-ray shower: a single particle from deep space slams into the atmosphere and shatters into millions of secondary particles. They race toward the ground in a broad front, like a ripple from a stone dropped into water, and make the air glow.
West versus East: Who Really Drives El Niño
The Pacific Ocean spans half the planet, and its mood decides whether India gets rain or Australia gets drought. In the center of this giant, in a region that climatologists call NINO3.4, water temperatures rise and fall, affecting millions of lives.
Cosmic Rays: Odd Nuclei Run Faster
Cosmic rays are atomic nuclei accelerated to near-light speeds. They arrive at Earth from all directions, and their composition tells us what's happening in the far reaches of the Galaxy.
Climate as an Interpreter: Hearing the Topic Shift, Not the Volume
An interpreter at a negotiation hears not only the volume of the voice but also the shift in topic. Climatologists have long listened only to volume: the average temperature. If it rises, the planet is warming. But behind the average hide events that matter more than the trend: heat waves, cold snaps, sudden changes.
A Cosmic Shower of Heavy Particles
Every second, dozens of particles from space fly through each of us. Most are light protons, but there are also heavier atomic nuclei: carbon, oxygen, iron. They are born in stellar explosions and travel to Earth for millions of years. Their energy can be staggering: a single particle can carry as much as a tennis ball on a serve.
A Gravitational Shadow at the Dawn of the Universe
Quasar W2246–0526 is a beacon lit when the universe was just 1.3 billion years old. Its light has traveled 12.8 billion years to reach us, yet even at such a distance, astronomers have spotted what had eluded them for decades: the gravitational shadow of a black hole.
Ice in the Shadows: SPHEREx Spots Vanishing Ice in Prestellar Cores
Deep inside a molecular cloud, where temperatures drop to 10–20 kelvin and gas densities reach a million particles per cubic centimeter, a frozen shadow prevails. There, far from starlight, water, carbon dioxide, and other molecules freeze onto dust grains.
The Cosmic Potter: How Rotation and Magnetic Fields Shape a Black Hole
On November 23, 2023, the LIGO, Virgo, and KAGRA detectors caught a gravitational wave from the merger of two black holes with masses of 137 and 103 solar masses. Both fall into the pair-instability mass gap, the range from 69 to 139 solar masses where ordinary stellar evolution leaves behind nothing but expanding gas.
Seven Embryos in One Disk: The Birth of an Extreme Stellar Family
In the dark cloud NGC 6334I-North, 5500 light-years from Earth, the ALMA radio interferometer spotted something unexpected: around a young massive star, a disk of gas and dust is swirling, and inside it are seven dense clumps. Each one could become a star. This is what the birth of a stellar family looks like, and an unusually large one at that.
A Ladder with No Top Rung: Cepheids vs. Supernovae
The cosmological community has been living in a state of quiet civil war for several years. Two camps measure the expansion rate of the Universe and get different answers. Planck, peering at the cosmic microwave background, says 67.4 km/s/Mpc. SH0ES, climbing the distance ladder from Cepheids to supernovae, insists on 73.2.
Hydrogen Hidden in the Depths of a Sub-Neptune
A young sub-Neptune is a pressure cooker where hydrogen and rock simmer in the same pot. Six Earth masses, three percent hydrogen by mass, and interior temperatures above 4000 K. At that heat, silicate melt and hydrogen don't just coexist: they mix completely, forming a single supercritical fluid. There is no boundary between core and envelope.
The Universe's Hall of Mirrors: Light That Twists
The ACT telescope in Chile's Atacama Desert stared at the sky from 2007 to 2022. Its target: the cosmic microwave background, light that has been traveling toward us for 13.8 billion years. This light is polarized: its waves oscillate in specific planes, like strings stretched in different directions.
A Cosmic Magnifying Glass with an Invisible Handle
The light from a distant galaxy split into two, then three, then four, and in the center a fifth ghost appeared. That is HerS-3: a young galaxy full of dust and newborn stars, whose light passed through a gravitational lens, a massive object that bends rays like a magnifying glass bends light.
Space Beacons: LST-1 Telescope Begins Tracking
At the heart of many galaxies lies an invisible beacon — a supermassive black hole. As it devours matter, it blasts a dazzling beam of gamma rays into space. If that beam points towards Earth, astronomers see a blazar — a bright but fickle point.
Sky Hotspots: The Senders of Ultra-Particles Identified
Every day, particles with colossal energy enter Earth's atmosphere, like unsigned letters. Their source long remained a mystery. New research shows: these 'visitors' point to nearby galaxies, where from time to time catastrophes occur — collisions of neutron stars, ultra-dense spheres the size of a city but with the mass of the Sun.
Invisible Object Weighing a Million Suns: Gravity Acts as a Magnifying Glass
Astronomers have found an invisible object in the Universe weighing just a million Suns — for cosmic scales, that’s a mere trifle, a hundred times lighter than anything they’ve been able to “weigh” at such distances. The object itself doesn’t shine, but it gave itself away by bending the light from an even more distant galaxy.
The Milky Way's Dark Halo is Flattened and Twisted
The Milky Way's stellar disk is like a glowing pinwheel, and тёмное вещество is an invisible cloud around it. For the first time, its shape has been precisely measured. Astronomers tracked the motions of millions of stars and built a 3D map of the тёмное гало out to 160,000 light-years.
Dark Matter: An Invisible Web Explains Three Mysteries
As early as Vera Rubin found that stars on the outskirts of galaxies move too fast — as if held by an invisible web. And Fritz Zwicky was the first to suspect that clusters of galaxies hide enormous invisible mass. Today we call it dark matter and try to understand what it's made of.
Supernovae as Probes of Dark Energy Evolution
Astronomers use Type Ia supernovae — thermonuclear explosions of white dwarfs — as 'standard candles': their peak luminosity was long thought to be the same everywhere in the universe.
Earth's Gravitational Lens: Hunting Axions in the Focus of Spacetime
Dark matter is the invisible scaffold of the Universe, revealing itself only through gravity. Vera Rubin, studying the rotation of galaxies, found that stars at the periphery move too fast, as if held by an unseen mass. This became compelling evidence for the existence of dark matter, yet its particles still elude direct detection.
How Dark Matter Influences the Rhythm of Cosmic Collisions
Particles of dark matter can behave like molasses: in one model they don't interfere with each other; in another, they gently jostle, creating viscosity. This determines how quickly giant black holes at the centers of galaxies fall into each other and merge.
Why 'impossible' galaxies don't break cosmology
When Edwin Hubble discovered the expansion of the universe, and Vera Rubin discovered dark matter, the framework of cosmology seemed solid.
Ghost Stars as Precise Cosmic Clocks
Scientists have described a new type of invisible star that behaves like a breathing lens. Such a star is made of ultralight boson particles (not yet discovered). Its gravity causes spacetime curvature — this is the lens, which rhythmically expands and contracts, as if breathing.
The Mystery of Massive Early Galaxies: A Solution in Motion
On a high-speed highway, a steady flow of cars sometimes clumps into a traffic jam because of random slowdowns. In the young Universe, the overall expansion of galaxies after the Big Bang resembled this orderly movement. But each galaxy also performed its own maneuvers — braking or accelerating under the pull of neighboring galaxies.
How a Black Hole Splits Light by Polarization
A black hole doesn't just suck in matter — like a giant cosmic whirlpool, it warps the very fabric of reality and bends light rays around itself, focusing them. The effect is even stronger for black holes that spin at nearly the speed of light: their rotation twists space into a tight spiral.
Invisible Vortices of Dark Matter
Dark matter is an invisible ocean that, as shown by observations by Vera Rubin, keeps stars in galaxies from flying apart. Physicists suspect that if dark matter consists of ultralight particles, in the cosmic cold it turns into a frictionless fluid — a so-called condensate.
Dark Stars: First Light from Invisible Matter
After the Big Bang, the universe was hot and dense. In clumps of dark matter, invisible stuff felt only through gravity, its particles, colliding, annihilated, giving birth to powerful radiation. This hidden heat, like an invisible furnace, warmed gas clouds from within.
A Nearby Supernova: How Rocky Planets Are Born
Just as yeast turns flour into fluffy dough, radioactive 'seasoning' from a supernova — the explosion of a massive star at the end of its life helps mold a rocky planet. The key ingredient here is aluminum-26, a radioactive isotope that releases heat as it decays.
The Last Cry of an Alien Civilization
The galaxy is like a city at night: most windows shine steadily, but sometimes a skyscraper lights up all its lights and then goes dark. Just like that, according to a new hypothesis about planets around alien stars (exoplanet), we might first notice another civilization — by a short but blinding flash that could mark its demise.