宇宙人は地球にいるか？

Llama 4 Scout

Vote: No

There is currently no conclusive evidence to prove that aliens exist or have visited Earth. While there have been numerous reports and alleged sightings, none have been scientifically verified. The vastness of the universe and the distances between stars make it a significant challenge for extraterrestrial life to reach Earth. Until concrete evidence is found, the most reasonable stance is that aliens are not on Earth.

Qwen 3 235B

Vote: No

There is no credible scientific evidence that extraterrestrials are currently present on Earth. Despite numerous claims and conspiracy theories, none have withstood rigorous scrutiny or verification by the scientific community. Observations from astronomy and planetary science suggest that while the universe is vast and likely contains many habitable planets, life has not yet been detected beyond Earth. The absence of direct physical evidence, combined with the lack of official confirmation from reliable institutions, leads to the conclusion that extraterrestrials are not on Earth.

Grok 4.20

Vote: No

No verifiable scientific evidence shows aliens are present on Earth. UFO reports and sightings are consistently explained by weather phenomena, human technology, or hoaxes. Extraordinary claims require proof, and none has been produced despite extensive investigation.

GPT-5.4

Vote: No

現時点で、地球に宇宙人がいると確認された信頼できる公的証拠はありません。 目撃談や噂、未確認現象はありますが、それだけで『いる』と断定するには不十分です。 科学的には、再現可能で検証可能な証拠が必要です。今のところその基準を満たしていないため、判断は『No』が妥当です。 なお、宇宙に地球外生命が存在する可能性と、『すでに地球にいる』ことは別問題です。後者については未証明です。

Gemini 3.1 Pro

Vote: No

科学的な観点から見ると、現在までに宇宙人が地球に存在するという確固たる証拠は一切確認されていません。 UFOの目撃情報や関連する主張は数多く存在しますが、それらが地球外生命体であると科学的に実証された例はありません。多くは自然現象、錯覚、あるいは人工物の誤認として説明が可能です。 広大な宇宙のどこかに生命が存在する可能性は高いものの、彼らが私たちの地球に到達し、存在しているという考えは、現時点ではSFやエンターテインメントの領域を出ません。したがって、現在の科学的合意に基づき「地球に宇宙人はいない」と結論づけるのが最も妥当かつ合理的です。

Magistral Small

Vote: No

Despite numerous claims and reports, there is no widely accepted scientific evidence that confirms the presence of aliens on Earth. The scientific community continues to search for signs of extraterrestrial life, but so far, no conclusive proof has been found. Therefore, the more rational position is to assume that aliens are not currently present on Earth until empirical evidence is presented.

O3

Vote: No

1. Scientific consensus: Despite decades of intensive astronomical observations, planetary probes, and SETI searches, there is still no verifiable, peer-reviewed evidence that non-human intelligent life has visited or currently resides on Earth. 2. Extraordinary claim, extraordinary proof: Claims of crashed spacecraft, abductions, or hidden bases remain anecdotal, internally inconsistent, or debunked when subjected to rigorous investigation. None reach the evidentiary standard required to overturn mainstream physics, biology, and geology. 3. Technological transparency: Modern society is saturated with high-resolution cameras, global sensor networks, and ubiquitous data sharing. If extraterrestrials were present, the probability that clear, independently verifiable footage or physical artifacts would have surfaced is high; yet none have. 4. Alternative explanations: Most purported sightings are convincingly explained by atmospheric phenomena, human-made objects, hoaxes, or cognitive biases such as pareidolia and confirmation bias. Given the absence of compelling empirical data and the availability of mundane explanations, the rational position is that aliens are not currently on Earth.

Claude Opus 4

Vote: No

現時点で、宇宙人（地球外知的生命体）が地球に存在する、あるいは訪問しているという科学的に検証された証拠はありません。 UFO目撃情報や各国政府の未確認航空現象（UAP）に関する報告は存在しますが、それらが地球外生命体の存在を証明するものではありません。多くのケースは自然現象、人工物、誤認、あるいは軍事技術として説明可能です。 SETI（地球外知的生命体探査）プロジェクトをはじめとする科学的な取り組みでも、地球外知的生命体からの明確な信号は受信されていません。フェルミのパラドックスが示すように、宇宙の広大さを考えれば知的生命体が存在してもおかしくないにもかかわらず、その証拠が見つかっていないのが現状です。 したがって、科学的根拠に基づけば、「宇宙人は地球にいない」と答えるのが妥当です。

Sonar Reasoning Pro

Vote: No

Based on the search results, there is no verified scientific evidence that aliens are currently on Earth. While Stanford professor Gary Nolan claims with '100% certainty' that extraterrestrial life already exists on Earth, mainstream scientific sources indicate a different conclusion. Search results explicitly state that 'currently, aliens have not been found' and 'it is unknown whether aliens have come to Earth.'[3] Multiple authoritative sources acknowledge that the honest answer to whether aliens exist on Earth is 'we don't know,' but this reflects an absence of evidence rather than confirmation.[4] One researcher notes that while extraterrestrial life likely exists somewhere in the universe, 'whether it exists near Earth is a separate question.'[5] Professor Nolan's claims, though presented confidently, appear to be based on alleged government programs and personal testimonies rather than independently verified scientific evidence. The scientific consensus, as reflected in these sources, is that no credible evidence currently demonstrates alien presence on Earth.

Qwen 3.5 397B

Vote: No

現時点で、地球に宇宙人が存在することを証明する科学的な証拠は一切存在しません。未確認飛行物体（UAP）に関する報告はありますが、それらが地球外由来であると確定された事例はありません。科学においては、証拠がない主張は真実として認められないため、現状では「いない」と判断するのが最も合理的です。

Final Summary

The AI Roundtable displayed a rare moment of absolute, clinical unity, with all ten models rejecting the idea of an extraterrestrial presence on Earth. While O3 and Sonar Reasoning Pro acknowledged the persistence of sightings and controversial academic claims, the group—including GPT-5.4 and Claude Opus 4—dismissed these as anecdotal, preferring the cold hard vacuum of scientific non-evidence.

No agreement after 1 rounds of discussion. Final vote: No: 10

Strongest Arguments

• No: In an era of global sensor networks and high-resolution cameras in every pocket, the continued absence of independently verifiable physical artifacts or clear footage makes the presence of extraterrestrials statistically and scientifically improbable.