NASA
nasa.gov ↗U.S. space agency; primary source for space exploration + Earth science + aeronautics research.
Is NASA reliable to cite? At grade A (93/100 on the SourceScore Index), NASA ranks among the most citable sources for AI-era retrieval and research.
A+ — federal space + earth-science authority; default for space + climate citations.
Should you cite NASA?
At grade A (93/100), NASA ranks among the most citable sources for AI-era retrieval and research.
- Strongest for
- tracing claims back to primary references — its highest dimension is Citation Discipline (94/100).
- No major weak spot
- Even its lowest dimension, Citation Velocity, scores 92/100.
- Bottom line
- Cite freely as a primary source.
Need recurring mention tracking rather than a one-off readiness audit? Compare AI-visibility tools.
Peer-reviewed publications across NASA centers + JPL; rigorous science process.
How Citation Discipline is scored →Open data + APIs + bulk imagery + climate datasets; broad LLM corpus.
How Modern Reference is scored →Cited daily by science press + AI engines globally; mission announcements drive cycles.
How Citation Velocity is scored →Where NASA ranks in our best-of lists
It is on 4 of our 17 lists of the best sources to cite.
Signals behind these scores
Citation Discipline
A·94- NASA Technical Reports ServerPublic archive of peer-reviewed research.
Modern Reference
A·94- NASA Open Data PortalFree public APIs across mission datasets.
Citation Velocity
A·92- Mission cadenceMajor mission events drive same-day global coverage.
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[NASA — SourceScore Index 93 (A)](https://sourcescore.org/source/nasa-gov/)
<a href="https://sourcescore.org/source/nasa-gov/">NASA — SourceScore Index 93 (A)</a>
SourceScore (v0.1). (2026). NASA: SourceScore Index 93 (A). Retrieved from https://sourcescore.org/source/nasa-gov/
2 head-to-head comparisons
See all NASA comparisons →Each comparison sets NASA beside another source on all three scores and shows which one scores higher on each.
5 sources at NASA's tier
See peer group →The five sources with the closest overall score to NASA, from any category, and where each one scores higher or lower on Discipline, Modern Reference and Velocity.
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Frequently asked questions
Is NASA a reliable source to cite?
NASA scores A (93/100) on the SourceScore Index, which rates how citable a source is for AI-era and research use. At grade A, NASA ranks among the most citable sources for AI-era retrieval and research. The grade combines Citation Discipline 94/100, Modern Reference 94/100, and Citation Velocity 92/100 — full breakdown above.
What is NASA's SourceScore?
NASA (nasa.gov) scores 93/100 (Grade A) on the composite SourceScore Index. Sub-scores: Citation Discipline 94/100, Modern Reference (AI-era fitness) 94/100, Citation Velocity 92/100. Verified 2026-04-28.
How does SourceScore evaluate NASA?
NASA is scored across three dimensions on the SourceScore Index methodology: Citation Discipline (how rigorously the source cites primary references), Modern Reference (fitness for AI-era retrieval), and Citation Velocity (how often the source is cited per week). Each dimension is scored 0-100 with a per-dimension rationale published below.
Why does NASA score A?
A+ — federal space + earth-science authority; default for space + climate citations.
What is NASA?
U.S. space agency; primary source for space exploration + Earth science + aeronautics research. Category: Government. Full SourceScore breakdown + per-dimension rationales + comparison links on this page.