Sky science
Neutron Star
Direct answer
Neutron Star: A Neutron Star is an ultradense collapsed core left by some massive-star supernovae, supported by nuclear-scale physics.
It is a city-sized remnant with stellar-scale mass.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- White Dwarf, Brown Dwarf, Pulsar, Stellar Black Hole
It is a city-sized remnant with stellar-scale mass.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Neutron Star
The neutron was discovered before pulsars provided compelling observational evidence for neutron stars.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Neutron Star matters
Neutron Star enables tests of dense matter, strong gravity, magnetic fields, and relativity.
Neutron Star in practice: an example
A teaspoon analogy conveys density only approximately; real material cannot be removed that way.
Where readings of Neutron Star go wrong
Not every core-collapse supernova leaves a neutron star; some remnants become black holes.
Sources and editorial method
Research references used for this entry include:
- NASA Science: Stars - NASA overview of stellar birth, main-sequence evolution, giant phases, remnants, and supernovae.
- NASA Science: Universe Glossary - NASA definitions for common stellar, galactic, orbital, and high-energy astronomy terms.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
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Common questions
What is a Neutron Star?
A Neutron Star is an ultradense collapsed core left by some massive-star supernovae, supported by nuclear-scale physics.
What do people get wrong about a Neutron Star?
Not every core-collapse supernova leaves a neutron star; some remnants become black holes.
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