Are neutron stars typically around 10 kilometers in radius and 1.4 solar masses?
NoParrot Fact Check · September 9, 2026
Fact-checked by NoParrot's 4-model methodology · Last verified September 9, 2026
NoParrot Score
Mostly consistent
Claim breakdown
- Verified
- 1
- Uncertain
- 1
- Disputed
- 0
Synthesis
Neutron stars are typically described as having a radius of approximately 10 to 12 kilometers and a mass around 1.4 solar masses. This canonical estimate is supported by observations of pulsars and X-ray binaries, which often cluster around these parameters. The radius of a neutron star is thought to depend on its equation of state.
While 1.4 solar masses is a common figure, observed neutron stars do vary in mass, with the heaviest confirmed neutron stars approaching about 2.1 solar masses. The 1.4 solar masses value specifically reflects the typical mass of neutron stars measured in binary pulsar systems. These typical values for mass and radius derive from core-collapse supernova models, where the remnant mass clusters near the Chandrasekhar limit for neutron-rich matter, and nuclear-density equations of state, which yield a radius of approximately 10 km for a 1.4 solar mass star.
What each model said
- Gemini ✓ All verified
Yes, neutron stars are typically around 10 kilometers in radius and have masses close to 1.4 solar masses.
- Claude ✓ 3 ⚠ 1
Yes. Typical neutron stars have radii of about 10–12 km and masses around 1.4 solar masses, though observed masses range from roughly 1.1 to over 2 solar masses (the heaviest confirmed ones approach ~2.1 M☉). The 1.4 M☉ figure is close to the Chandrasekhar limit and reflects the typical mass of neutron stars formed in core-collapse supernovae, particularly those measured in binary pulsar systems.
- GPT ✓ 3 ⚠ 1
Yes. A “canonical” neutron star is often described as about: - **Mass:** ~**1.4 solar masses** - **Radius:** ~**10–12 kilometers** So the rough statement “**10 km radius and 1.4 solar masses**” is a good typical estimate. In reality, observed neutron stars vary: masses are commonly around **1.2–2.0 solar masses**, and radii are thought to be roughly **10–14 km**, depending on the dense-matter equation of state.
- Grok ✓ 3 ⚠ 2
Yes, neutron stars typically have masses of ~1.4 solar masses and radii of ~10–12 km. These values derive from core-collapse supernova models, where the remnant mass clusters near the Chandrasekhar limit for neutron-rich matter, and from nuclear-density equations of state that yield a radius of order 10 km for a 1.4 M⊙ star. Observed pulsars and X-ray binaries cluster around these parameters, though measured radii range 10–14 km depending on the equation of state.
Models Used
- Gemini
- Claude
- GPT
- Grok
Disclaimer: This page summarizes the output of 4 frontier large-language models at a single point in time. NoParrot Score reflects cross-model consensus, not absolute truth. Models can be wrong, and consensus can be wrong with them. Treat this page as a research aid, not a final verdict.
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