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Multi-messenger physics

The universe doesn't only send light · gravitational waves from colliding black holes · neutrinos from distant supernovae · particle collisions at CERN recreating the early universe — all of it, live.

[01]   The Four Messengers of Modern Astronomy Particle physics primer
Electromagnetic

Photons

Light. Radio waves. X-rays. Gamma rays. The familiar messengers — what every telescope sees. Travels at lightspeed. Blocked by dust, gas, and absorbing material between source and Earth.

Gravitational

Spacetime ripples

Predicted by Einstein in 1916, first detected in 2015 by LIGO. When massive objects accelerate violently — black holes merging, neutron stars colliding — they ripple spacetime itself. Pass through anything. Reveal the invisible universe.

Weak force

Neutrinos

Ghostly particles produced in nuclear reactions — supernovae, the Sun's core, cosmic ray collisions, particle accelerators. So weakly interacting that 100 trillion pass through you per second, almost none touching anything. Carry information from places photons can't escape.

Particle

Cosmic rays

Charged particles — mostly protons — accelerated to near-lightspeed by supernova shock waves, active galactic nuclei, and other extreme cosmic engines. Bend in magnetic fields, so we see where they hit us, not where they came from. Studied at colliders too: CERN's LHC creates conditions like the early universe.

[02]   Gravitational Wave Candidates LIGO/Virgo/KAGRA · Run O4 · GraceDB SPACETIME RINGS
Listening to spacetime…
[03]   High-Energy Neutrino Alerts IceCube · South Pole · via NASA GCN GHOST PARTICLES
Tuning to the ice…
[04]   Large Hadron Collider · CERN 27 km ring · Geneva · 175 m underground RUN 3
Beam Energy · Each Beam
6.8 TeV

Two counter-rotating proton beams collide head-on at 13.6 TeV total — the highest-energy collisions humans have ever produced. Each beam contains ~2,800 bunches of ~100 billion protons traveling at 99.9999991% the speed of light.

Current Run Status
Run 3
Started July 2022 · scheduled through 2026 · then Long Shutdown 3 begins for HL-LHC upgrade
Collisions / Second
~1 billion
Bunch crossings happen 40 million times per second; each can produce 30+ proton-proton collisions
Detector Temperature
−271.3°C
Magnets cooled to 1.9 K with superfluid helium · colder than deep space
Higgs Bosons / Day
~30,000
When running at peak luminosity · most decay before detection · only ~3,000 are reconstructable
Active Experiments
4 main
ATLAS · CMS · LHCb · ALICE — plus smaller experiments at the same ring
Ring Circumference
26.659 km
Crosses Swiss-French border · former tunnel of LEP collider (1989-2000)
[05]   Detector Network · Global Coverage Listening in concert
LIGO Hanford LIGO Livingston Virgo (Italy) KAGRA (Japan) IceCube (South Pole) CERN LHC Super-K (Japan) Fermilab EQUATOR
Gravitational wave detectors Neutrino observatories Particle accelerators
[06]   Why this matters Multi-messenger astronomy

The first time the universe sent us multiple messages at once

On August 17, 2017, LIGO detected gravitational waves from two colliding neutron stars 130 million light-years away. 1.7 seconds later, NASA's Fermi telescope saw a burst of gamma rays from the same direction. Hours later, optical telescopes saw the kilonova fading. X-rays. Radio waves. The full spectrum.

This was multi-messenger astronomy being born — using all four messengers simultaneously to study a single cosmic event. We learned that neutron-star collisions create most of the universe's gold and platinum. We confirmed Einstein's theory to extraordinary precision. We measured the Hubble constant in a brand new way.

Now imagine: every gravitational wave alert that pops up on this page could be the next event like that. IceCube neutrinos coincident with a LIGO alert? An astrophysicist's most-watched-for combination. CERN data feeds into the theory that explains all of it. You're watching modern physics happen in real time.