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Neutron Binary

Short answer: In a binary neutron star system, the stars lose orbital energy by emitting gravitational waves, ripples in spacetime predicted by Einstein's general relativity. Their orbits shrink and speed up until they collide and merge.

The first such merger was detected in gravitational waves and light on August 17, 2017 (GW170817). The footage, credited to astronomhub, shows an animation of two neutron stars merging.

VideoWrite-up1 sources
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What should you know about Neutron Binary?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. Binary neutron stars.

    DD-542-F01 · Write-up · Exhibit A (System)

  2. Gravitational waves.

    DD-542-F02 · Write-up · Exhibit B (Energy loss)

Video transcript: Neutron Binary: Two Neutron Stars in Orbit Slowly Spiral Together

Did you know, when two neutron stars orbit each other in a binary system, they gradually spiral inward due to the emission of gravitational waves, ripples in space-time predicted by Einstein's theory of general relativity. As they lose energy, their orbital speed increases, and the distance between them shrinks until they collide and merge in a violent event. NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 17.6s Reel ·

Video coming soonNeutron Binary · Instagram Reel
Neutron Binary: Two Neutron Stars in Orbit Slowly Spiral Together Instagram Reel · · 17.6s

The write-up

Two neutron stars in orbit slowly spiral together. Gravitational waves carry away their energy.

  1. Exhibit A

    System

    Binary neutron stars.

  2. Exhibit B

    Energy loss

    Gravitational waves.

  3. Exhibit C

    Theory

    General relativity.

  4. Exhibit D

    End

    Merger.

  5. Exhibit E

    Detected

    GW170817, 2017.

Questions people ask about Neutron Binary

What carries energy away?

Spacetime.

Source: Write-up · Exhibit A (System) · Wikipedia: Neutron star merger

Predicted by?

Relativity.

Source: Write-up · Exhibit B (Energy loss) · Wikipedia: Neutron star merger

Orbit over time?

Inspiral.

Source: Write-up · Exhibit C (Theory) · Wikipedia: Neutron star merger

End result?

Collision.

Source: Write-up · Exhibit D (End) · Wikipedia: Neutron star merger

First detection?

GW170817.

Source: Write-up · Exhibit E (Detected) · Wikipedia: Neutron star merger

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. What carries energy away?

    1. Gravitational waves
    2. Sound
    3. Wind
    4. Magnets
    Show the answer

    Answer: A. Gravitational waves Spacetime. Source: Write-up · Exhibit A (System) · Wikipedia: Neutron star merger

  2. Predicted by?

    1. Einstein
    2. Newton
    3. Galileo
    4. Kepler
    Show the answer

    Answer: A. Einstein Relativity. Source: Write-up · Exhibit B (Energy loss) · Wikipedia: Neutron star merger

  3. Orbit over time?

    1. Shrinks
    2. Grows
    3. Stops
    4. Reverses
    Show the answer

    Answer: A. Shrinks Inspiral. Source: Write-up · Exhibit C (Theory) · Wikipedia: Neutron star merger

  4. End result?

    1. Merger
    2. Separation
    3. Freeze
    4. Nothing
    Show the answer

    Answer: A. Merger Collision. Source: Write-up · Exhibit D (End) · Wikipedia: Neutron star merger

  5. First detection?

    1. 2017
    2. 1990
    3. 2005
    4. 2023
    Show the answer

    Answer: A. 2017 GW170817. Source: Write-up · Exhibit E (Detected) · Wikipedia: Neutron star merger

Cite this case file

Easterling, Marcus. "Neutron Binary." The Detail Department (DetailEnjoyer), case file DD-542, last updated Apr 13, 2025. https://detailenjoyer.com/case/neutron-binary/

Permalink: https://detailenjoyer.com/case/neutron-binary/ · Last updated

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