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A neutron star is the remnant of a massive star after an explosion. Its matter is compressed so tightly that a teaspoonful would weigh as much as a mountain. Atoms are crushed, and the star consists almost entirely of neutrons.

History

In 1934, Walter Baade and Fritz Zwicky predicted the existence of neutron stars. The first was discovered in 1967 by Jocelyn Bell Burnell as a pulsar—a source of regular radio pulses.

How it works

A neutron star remains visible thanks to residual heat and a powerful magnetic field. When it rotates rapidly, beams of radiation from its magnetic poles sweep past Earth like a lighthouse beam—that's how we detect pulsars.

💡 Neutron stars spin insanely fast—some make hundreds of revolutions per second. Like a spinning top that never stops.
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Scientists
Fritz ZwickyJocelyn Bell Burnell
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Accretion diskangular momentumfast radio burstgravitational waveskilonovaLIGOmagnetarneutrino
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Fermi–Dirac statisticsChandrasekhar limitquadrupole radiation formula

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Neutron stars could be more compact than black holes

Black holes are the record holders for compressing matter. But physicists have found a way for neutron stars to beat them in density: just add tiny corrections to the theory of gravity that kick in under extreme conditions. Calculations show that such ultra-dense stars are stable and can produce gra
arXiv:2605.19731 · 2026-05-19

Quantum Assistant Detects Rare Frauds

Q-SYNTH combines quantum and classical computers to synthesize fake fraudulent payments. In a world where real scams make up only 0.1% of all transactions, training on imagined threats makes detectors sharper. The artificial examples become so realistic that the system itself sometimes mistakes them
arXiv:2605.21164 · 2026-05-20

Neutron Stars with a Secret 'Doughnut' Inside

Neutron stars may hide a secret. Inside them, an invisible ring sometimes forms—a 'doughnut' made of a special field. It alters the internal structure so that the star mimics a quark star, but from the outside it's unnoticeable. The discovery explains the strange sizes and masses of some neutron sta
arXiv:2605.26228 · 2026-05-25

The Swirling Dance of Neutron Stars

New simulations show how neutron star spin changes the merger outcome. Aligned spins birth a narrow jet, opposite spins — chaos. Ghostly neutrinos turn the ejecta into proton-rich matter, where nickel-56 ignites. Its glow reveals a long-lived remnant.
arXiv:2605.30548 · 2026-05-28

Gravitational Waves: Listening to Space without Templates

Pulsars are cosmic lighthouses beaming radio pulses with the precision of atomic clocks. A passing gravitational wave disrupts this rhythm. Instead of searching for familiar patterns, the new technique listens to all the noise and picks out any signal, decomposing it into frequencies and applying a
arXiv:2606.00577 · 2026-05-30

Rotating Wormhole Without Exotic Matter

Scientists considered a theory of gravity where matter curves space more strongly. In this model, rotation prevents the wormhole from collapsing, eliminating the need for exotic matter. Since almost all cosmic bodies rotate, such tunnels could form naturally. They would be betrayed by a double shado
arXiv:2606.01141 · 2026-05-31

A Polygraph for Flashes: How the Pincus–Lyapunov Diagram Uncovers FRBs

To unravel the nature of fast radio bursts (FRBs), astrophysicists applied methods from nonlinear dynamics and constructed the Pincus–Lyapunov diagram, comparing them with pulsar glitches, solar flares, and earthquakes. It turned out: repeating FRBs form a compact cluster on the border between stoch
arXiv:2606.01855v1 · 2026-06-01

The Snapping Cable of Reality: How Finite String Thickness Accelerates Quantum Decay and Reshapes the Gravitational Hum

In the early Universe, the Big Bang could have spawned cosmic strings—one-dimensional defects whose enormous energy can still shake spacetime. Their decay through quantum tunneling dictates the gravitational signal that detectors will pick up. New lattice modeling has shown: the string's finite thic
arXiv:2606.03008v1 · 2026-06-02

Cosmic Detective: Two Independent Clues Against the Main Cosmological Debate

The Hubble constant — the expansion rate of the universe — has become a bone of contention: data from the cosmic microwave background and the distance ladder diverge by 6 sigma. Astrophysicists have proposed a new arbitration by cross-breeding 142 gravitational-wave events from the GWTC-4 catalog wi
arXiv:2606.03634v1 · 2026-06-02

Quiet Quark Waltz: New Data Tighten Bounds on Color Superconductivity

Weaving together NICER, LIGO, and heavy pulsar observations with neural networks and quantum chromodynamics equations, scientists have for the first time imposed a tight constraint on the color-flavor locking parameter (ΔCFL < 66 MeV) — half as wide as previous model estimates. It turns out that col
arXiv:2606.03707v2 · 2026-06-02

Dance of Vortices in the Magnetic Heart of a Pulsar

Why do pulsars—rapidly spinning neutron stars—fall silent for tens of periods, then emit modulated pulses one after another? New three-dimensional modeling unveils the dance of non-axisymmetric plasma vortices: the diocotron instability makes charges break into a dance across magnetic field lines, r
arXiv:2606.03984v1 · 2026-06-02

Echoes of Black Holes: How Gravitational Sirens Reveal the Curvature of the Universe

Gravitational waves from mergers of black holes and neutron stars are not just ripples of curved spacetime but precise 'standard sirens' for measuring distances. A new study demonstrates that the Cosmic Explorer and Einstein Telescope detectors will be able to determine curvature Ω_k with an error o
arXiv:2606.04216v1 · 2026-06-02

Cosmic Waltz: How a White Dwarf Became a Radio Beacon

The system ASKAP J1745−5051 is a close binary where a magnetic white dwarf strips material from a red dwarf every 1.37 hours. The resulting radio bursts are so powerful that their brightness temperature exceeds 10^12 K, requiring a coherent emission mechanism — a cosmic analog of a laser. Spectrosco
arXiv:2606.04232v1 · 2026-06-02

The Universe's Radio Concert: How 30 Seconds of Silence Are Changing Physics

Using the OVRO–LWA array, astronomers conducted an unprecedented survey in the 50–86 MHz band with 10 Hz resolution. The 30-second exposure produced over three million images, setting strict limits on the power of hypothetical transmitters around nearby stars. No extraterrestrial signal was detected
arXiv:2606.04304v1 · 2026-06-03

Dark mountains of neutron stars: gravitational waves probe dark matter

Researchers combined a two-fluid model of neutron stars with fermionic dark matter and results from the search for continuous gravitational waves by the LIGO detectors. An anisotropic distribution of dark matter can create 'dark mountains' — quadrupole deformations that amplify emission. Comparison
arXiv:2606.05082v1 · 2026-06-03

Magnetic Forge: Plasma Pulsations Give Birth to Record Energies

In astrophysical plasma with high beta parameter — from planetary magnetospheres to accretion disks around black holes — particles with non-thermal energies are often detected. New kinetic simulations have shown for the first time: they are produced by magnetic pumping — rhythmic cycles of compressi
arXiv:2606.05286v1 · 2026-06-03

Magnetic Thermos of Stars: Birth of a Micronova

In the tight binary system IGR J17014-4306, astronomers recorded an optical flare of a micronova — a localized thermonuclear explosion on a white dwarf. Over 1.56 days, it released 3.25×10³⁸ erg of energy, equivalent to burning a hydrogen column the mass of a small asteroid. This brought the rare cl
arXiv:2606.06305v1 · 2026-06-04

The Cosmic Tuning Fork: Einstein Telescope Will Catch Neutron Star Resonances

New large-scale modeling shows that the Einstein Telescope will be able to detect tidal resonances in neutron stars with an efficiency of about 32% for the loudest signals. The smallest detectable phase shift in gravitational waves will be around 0.03 radians—a tiny delay of a fraction of a millisec
arXiv:2606.06376v1 · 2026-06-04

Neutrino Lighthouse: The Hidden Heart of Supernova SN 2021foa

For the first time, a collapsing supernova is reliably linked to high-energy neutrinos. IceCube detected four neutrino events clustered in time and space near the peak brightness of SN 2021foa, a rare Type IIn supernova. The energy of the neutrino burst exceeded the optical by two orders of magnitud
arXiv:2606.06409v1 · 2026-06-04

The Neutrino Chord: How a Supernova Will Unveil the Hidden Mass Order

The next galactic supernova is a rare gift to astrophysics, capable of answering a key particle physics question in a fraction of a second. Analysis of two independent signals—the sharp peak of electron neutrinos in the first milliseconds and the rise rate of the electron antineutrino flux—points to
arXiv:2606.06580v1 · 2026-06-04

PeVatron's Hybrid Orchestra: A Particle Symphony at the Edge

Astrophysicists have built a self-consistent model of the source LHAASO J1849-0002, associated with the pulsar PSR J1849-0001. In the hybrid scenario, relativistic electrons from the pulsar wind nebula scatter the cosmic microwave background, while protons collide with a nearby molecular cloud, prod
arXiv:2606.06974v1 · 2026-06-05

Broken Prism: How a Pulsar Became a Cosmic Ghost

In December 2019, the CHIME telescope picked up a signal with a crisp periodicity of 217 ms, hailed as the first periodic FRB. It later turned out to be a series of giant pulses from the long-known pulsar PSR J0248+6021, misprojected 20 degrees to the south. The culprit was a crack in the mathematic
arXiv:2606.07087v1 · 2026-06-05

A Lens in the Depths: Why the Axion Limit Isn't Afraid of Exotics

Neutron stars are ultra-dense laboratories where matter is compressed to its limit, and hypothetical axions can reveal themselves through accelerated cooling. Even the addition of exotic baryons in the core hardly shifts the tight constraint on the axion mass; in some models, the limit brushes again
arXiv:2606.07742v1 · 2026-06-05

Message from the Invisible World: FAST Listens to Axions

Axions are ghostly particles, candidates for dark matter, capable of explaining both the hidden mass of the Universe and the violation of strong interaction symmetry. In the monstrous magnetic fields of neutron stars, they can momentarily become light — a radio pulse at a precisely defined frequency
arXiv:2606.17067v1 · 2026-06-05

Hunting Ghost Particles from a Supernova

A new method will allow catching particles with a microscopic charge, born in supernova explosions. They arrive after neutrinos, like a delayed wave. Perhaps dark matter is made of exactly such particles.
arXiv:2606.11310 · 2026-06-09

Twisted Solar Loop Reveals the Secret of Magnetic Explosions

A solar magnetic loop, twisted by 540 degrees, snapped at one end alone, spewing hot gas and hard X-rays. This proves that magnetic reconnection accelerates particles and heats the corona. Scientists found a pattern: the frequency of plasma pulsations directly indicates the strength of the magnetic
arXiv:2606.13953 · 2026-06-11

The Law of Unified Cooling: What Links Blazars and Gamma-Ray Bursts

Blazars are long-lasting beams from black holes in galactic cores; gamma-ray bursts are short flashes from stellar explosions. Scientists have discovered that, despite their different timescales, their radiation is shaped by the rapid cooling of electrons in a weakening magnetic field. This explains
arXiv:2606.15759 · 2026-06-14

Testing Gravity's Quantum Nature with Spin

Scientists have calculated how a massive rotating sphere can make a passing particle be in two places at once—a hallmark of quantum gravity. The effect, predicted by Einstein, is like a spoon dragging through honey. A tabletop experiment using this frame-dragging will show for the first time that gr
arXiv:2606.31678 · 2026-06-30

The Universe's Foundry: Kilonova Dust and the Birth of Gold

Astrophysicists have discovered that dust grains of refractory elements—tungsten and osmium—form in the ejecta of a kilonova. Their near-blackbody infrared emission perfectly matches JWST data for kilonova AT2023vfi. Simulations of cluster growth and radiative transfer confirmed the rapid formation
arXiv:2607.00433v1 · 2026-07-01

Dancing Dispersion: The Millisecond Life of a Neutron Star

FRB 20250613A, caught in a dwarf galaxy at z=0.0987, surprised us: its dispersion varied 50 times within minutes. The bursts repeat with a rhythm of 6.8 ms, as if a neutron star is spinning. And most strikingly, the brighter the pulse, the cleaner the ether: the radio wave accelerates oncoming elect
arXiv:2607.00505v1 · 2026-07-01

Cosmic Radio: How a Neural Network Catches the Whisper of Neutron Stars

The Aframe algorithm, previously honed on black hole mergers, now teases out signals from binary neutron star mergers from the noise of gravitational wave detectors in fractions of a second. Thanks to a trick from the radio engineer's toolbox—heterodyning—minute-long 'chirps' are compressed to just
arXiv:2607.01372v1 · 2026-07-01

The Silence of the Interstellar Wanderer: The Hunt for Radio Signals from 3I/ATLAS

Astronomers took advantage of the visit of the interstellar object 3I/ATLAS to conduct a unique radio reconnaissance. Using the 500-meter FAST telescope and the method of canonical polyadic decomposition, they analyzed the data, trying to extract periodic signals against the background of terrestria
arXiv:2607.01666v1 · 2026-07-02

Gravitational Atoms: When Boson Stars Break the Laws of Energy

Physicists investigated boson stars in teleparallel gravity, where a scalar field is non-minimally coupled to spacetime torsion. It turned out that excited states of these objects can have negative energy density, violating all four classical energy conditions. The compactness of these stars exceeds
arXiv:2607.02017v1 · 2026-07-02

Black Hole Cardiogram: NICER Records X-ray Heartbeat

In 2025, the NICER X-ray telescope aboard the ISS monitored the outburst of black hole 4U 1630−47, a binary system where matter from a companion star falls onto the compact object. Analysis revealed quasi-periodic oscillations (QPOs)—rhythmic flux variations with frequencies from 0.24 to 3.43 Hz—and
arXiv:2607.02228v1 · 2026-07-02

Dark Champagne: What Pulsars Revealed About the Phase Transition

Recently, pulsar timing array collaborations detected a stochastic background of nanohertz gravitational waves. Scientists investigated whether a first-order phase transition in the simplest dark sector — an Abelian Higgs model — could have produced it. Precision thermodynamic analysis using dimensi
arXiv:2607.02505v1 · 2026-07-02

Neutrino Tomography of Earth: A New Look at the Planet's Interior

Earth's internal structure is traditionally studied using seismic methods and gravimetry. But neutrinos—particles that barely interact with matter—offer a fundamentally different, gentle probe. The IceCube collaboration analyzed 10.7 years of muon neutrino observations with energies from 500 GeV to
arXiv:2607.02644v2 · 2026-07-02

Dark Core or Pearlescent Layer: Metamorphoses of Neutron Stars

Scientists used an agnostic approach to study how dark matter affects neutron star structure. Light dark matter forms extended halos that boost tidal deformability, while heavy dark matter creates a dense core, making the star more compact. Constraints from NICER and GW170817 show that the fraction
arXiv:2607.03840v1 · 2026-07-04

Pendulum without heating: X-ray mystery of PSR J0901-4046

Observations by the Chandra space observatory set a record-low upper limit on X-ray luminosity for the periodic radio pulse source PSR J0901-4046. Its period—75.9 seconds—is too long for a classical pulsar: there isn't enough electric potential to pull particles out of the vacuum. It was thought tha
arXiv:2607.03848v1 · 2026-07-04

Cosmic Lightning: How Fast Radio Bursts Illuminate Hidden Baryons

Analysis of 3455 fast radio bursts from the CHIME telescope has mapped electron density fluctuations in the cosmic web. The statistically significant signal at >3σ confirms that residual dispersion measures are not random, but reflect real baryon clumping. The method, which does not require precise
arXiv:2607.04106v1 · 2026-07-05

Cosmic Metronome: Binary Stars Search for Axion Dark Matter

Astrophysicists have proposed a method to search for ultralight axions — dark matter candidate particles — using high-precision polarimetric observations of close binary stars. In such systems, light reflected from the companion star's atmosphere creates a weak linear polarization strictly tied to t
arXiv:2607.04550v1 · 2026-07-05

Magnetic Echolocation: Measuring the Cosmic Cocoons of Fast Radio Bursts

Fast radio bursts (FRBs) — millisecond signals of colossal energy — remain one of the great mysteries of astrophysics. Their environment is often saturated with magnetized plasma that distorts polarization and scatters the pulses. A new technique combines the analysis of these distortions, akin to d
arXiv:2607.05289v1 · 2026-07-06

Cosmic Calligraphy: A General-Purpose Neural Network Catches Fast Radio Bursts

Fast radio bursts—ultra-short but colossally powerful radio flashes from distant galaxies—leave an elegant curved trace on spectrograms, resembling a calligraphic flourish. For decades they were hunted with heavy algorithms and narrow neural networks, until the most unexpected tool was tried: a mult
arXiv:2607.07382 · 2026-07-08