Claim: The moon is moving away from Earth every year

First requested: July 11, 2026 at 12:03 PM
88%

IsItCap Score

Truth Potential Meter

Very Credible

AI consensusWeak

Grader consensus is weak.
Range 50%–98% (spread Δ48).
The graders diverge. Treat the combined score as uncertain and read the sources carefully.
Read analysis summary

OpenAI Grade

0%
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80%
90%

Perplexity Grade

0%
20%
40%
60%
80%
98%

Google Gemini Grade

0%
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50%
Shareable summary
Verdict: Questionable
  • A minority view suggests planetesimal impacts or Earth contraction drive recession.
  • Recession rate varied historically; current rate may not be permanent.
/r/fact-check-moon-moving-away-earth

Analysis Summary

The claim that the moon is moving away from Earth every year is true. Mainstream scientific sources, including reputable outlets like BBC and Wikipedia, confirm that the moon is receding at a rate of approximately 1.5 inches (3.8 cm) annually due to tidal interactions. While there are minority views suggesting alternative causes for this phenomenon, they still acknowledge the established rate of movement. Thus, the consensus among scientists supports the claim's validity. The models diverge sharply — treat this as higher-uncertainty. Perplexity comes in highest (98%), while Gemini is lowest (50%). OpenAI expresses higher confidence than Gemini on this claim. While the majority of sources confirm that the moon is moving away from Earth at a rate of about 1.5 inches per year, there are alternative perspectives that suggest other factors may contribute to this phenomenon, such as prograde planetesimal impacts and Earth's contraction. However, these views do not significantly alter the established understanding of the moon's gradual recession, as they still reference the same rate of movement. Therefore, while there is some debate regarding the causes, the primary claim remains supported by credible evidence.

Source quality

Truth (from sources)9.00 / 10
Source reliability9.00 / 10
Source independence8.00 / 10

Claim checks

Fits established facts9.00 / 10
Logical consistency9.00 / 10
Expert consensus9.00 / 10

Source Analysis

Common arguments
Supporting the claim
  • Laser ranging from Apollo reflectors confirms 3.8 cm/year recession rate.
  • Tidal interactions transfer angular momentum, pushing Moon outward annually.
  • Multiple independent sources (NASA, BBC, Astronomy.com) agree on the rate.
Against the claim
  • A minority view suggests planetesimal impacts or Earth contraction drive recession.
  • Recession rate varied historically; current rate may not be permanent.
  • No evidence that recession will cause Moon to escape Earth's gravity soon.

Mainstream Sources

Publication

Astronomy.com

Title

Ask Astro: How quickly is the Moon moving away from Earth?

Summary

The Moon is moving away from Earth at about 1.49 inches (3.78 centimeters) per year due to tidal interactions.

Source details

Type: Blog
Secondary Reporting

Publication

Wikipedia

Title

Moon - Wikipedia

Summary

Lunar ranging experiments from Apollo laser reflectors confirm the Moon's distance increases by 38 mm (1.5 in) per year.

Source details

Type: Aggregator
Secondary ReportingPrimary Data

Publication

BBC

Title

How the Moon is making days longer on Earth

Summary

Scientists confirm the Moon is edging away at a rate of 1.5 inches (3.8cm) every year through laser measurements.

Source details

Type: Major Media
Published: 2023-03-03
Secondary Reporting

Alternative Sources

Publication

David Publisher

Title

Why Is the Moon Gradually Moving away from the Earth

Summary

A minority view argues the main causes are prograde planetesimal impacts and Earth's contraction, though it still cites the 3.8 cm/year rate.

Source details

Low EvidenceSecondary Reporting

Analysis Breakdown

True/False Spectrum (9.0)Source Credibility (9.0)Bias Assessment (8.0)Contextual Integrity (9.0)Content Coherence (9.0)Expert Consensus (9.0)88%

How to read the breakdown

Weakest areas
Independence8.0/10Truth9.0/10
  • Truth: how well sources support the core claim.
  • Source reliability: whether the sources have a strong track record.
  • Independence: whether coverage looks one-sided or recycled.
  • Context: missing details (timeframe, definitions, scope) that change meaning.
  • Tip: if graders disagree, rely more on the summary + sources than the single number.

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Methodology