1973 NASA-UAP-D5, Apollo 17 Crew Debriefing for Science, 1973

Page 1 --- … Cg_, ,,,,,,,Z” iiiiiiii!i!i!i!i!iiiill … MSC-07632 :i:>>…’ aiBriefing: ’## Document Overview

This document is an excerpt from the Apollo 17 crew debriefing for science, prepared by the Planetary and Earth Sciences Division at the Manned Spacecraft Center, Houston, and dated January 8, 1973. It captures astronaut reports on ultraviolet astronomy experiments conducted during the mission, focusing on observations of the Coma galaxy cluster and the high-galactic-latitude sky.

Source: Page 1 OCR (cover sheet: “APOLLO 17 CREW DEBRIEFING FOR SCIENCE,” “PREPARED BY PLANETARY AND EARTH SCIENCES DIVISION,” “JANUARY 8, 1973,” “MANNED SPACECRAFT CENTER HOUSTON, TEXAS”); pages 2–3 OCR content.

What This Document Contains

• Summary of ultraviolet (UV) telescope observations, including a search for ionized hydrogen in the Coma cluster and measurements of the UV background at the North and South Galactic Poles.

• Discussion of a non-detection of Lyman-alpha radiation from the Coma cluster, leading to a “real mystery as to what is holding the thing together.”

• Report of an anomalous UV spectrum at high galactic latitudes that appears like that of a hot star, but with no known hot stars in the field of view.

• Document is unclassified; internal NASA debrief transcript.

Source: Pages 2–3 transcript (Henry, CONT’D).

Key Observations

• “We looked for Lyman-alpha radiation, red shifted from the ionized hydrogen, and we didn”t see any… . I think that may leave a real mystery as to what is holding the thing together.”

• “The spectrum that we see looks like the spectrum of the hot star; however, we know that there were no hot stars within our field of view. Therefore, the most conservative interpretation, I think, is that what we”re seeing is light from hot stars in the galac[tic] …”

Source: Pages 2 and 3 (Henry, CONT’D).

Context & Significance

This is a standard post-mission scientific debrief, not a UAP-specific investigation. At the time, Apollo 17 carried instruments for astronomical observations from the lunar module or command module, and the crew reported unexpected astrophysical results. The anomalies described—missing binding mass in Coma and an unexplained UV glow—were early inputs to discussions about dark matter and the extragalactic background light. No UAP sightings or anomalous craft are mentioned. The document illustrates how space missions occasionally recorded unexplained astrophysical signals that later prompted further research.

Source: Scientific content of pages 2–3; metadata indicates routine NASA debrief.

Evidence Assessment

What this document shows:

• Astronauts reported an astrophysical mystery (Coma cluster mass discrepancy) and an unidentified UV spectral feature resembling a hot star but without any identifiable source.

What this document does NOT show:

• No confirmation of extraterrestrial origin or technology.

• No definitive identification of observed phenomena.

• No UAP sightings, encounters, or physical objects.

• Independent analysis should refer to the original document.

[WARN] Assessment: The document contains no evidence of UAP; the observations are purely astrophysical and were described in terms of known scientific questions (missing mass, diffuse UV background). The “mystery” pertains to gravitational binding and unidentified light sources, not to anomalous craft or non-human intelligence.’ keyFindings: [] tags:

• NASA
• Debrief
• Space relatedFiles: [] featured: false heroImage: /pdf-covers/nasa-uap-d5-apollo-17-crew-debriefing-for-science-1973.png documentType: Debrief region: Space decade: 1970s releaseBatch: Release 01 coverImage: /pdf-covers/nasa-uap-d5-apollo-17-crew-debriefing-for-science-1973.png archiveId: NASA-UAP-D5,Apollo_17_Crew_Debriefing_for_Science,1973 warGovUrl: https://www.war.gov/ufo/#NASA-UAP-D5, Apollo 17 Crew Debriefing For Science 1973 officialDescription: ’--- Page 1 --- … Cg, ,,,,,,,Z”_ iiiiiiii!i!i!i!i!iiiill … MSC-07632 :i:>>…’ evidenceLevel: Eyewitness Report hasUAPObservation: true mentionsPhysicalEvidence: false mentionsBiological: false ocrQuality: high

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[WARN] AI-Generated Summary: This summary is generated from publicly released government documents for informational purposes only. Always refer to the original document linked below for the complete unredacted record.

Document Overview

This document is an excerpt from the Apollo 17 crew debriefing for science, prepared by the Planetary and Earth Sciences Division at the Manned Spacecraft Center, Houston, and dated January 8, 1973. It captures astronaut reports on ultraviolet astronomy experiments conducted during the mission, focusing on observations of the Coma galaxy cluster and the high-galactic-latitude sky.

Source: Page 1 OCR (cover sheet: “APOLLO 17 CREW DEBRIEFING FOR SCIENCE,” “PREPARED BY PLANETARY AND EARTH SCIENCES DIVISION,” “JANUARY 8, 1973,” “MANNED SPACECRAFT CENTER HOUSTON, TEXAS”); pages 2–3 OCR content.

What This Document Contains

• Summary of ultraviolet (UV) telescope observations, including a search for ionized hydrogen in the Coma cluster and measurements of the UV background at the North and South Galactic Poles.
• Discussion of a non-detection of Lyman-alpha radiation from the Coma cluster, leading to a “real mystery as to what is holding the thing together.”
• Report of an anomalous UV spectrum at high galactic latitudes that appears like that of a hot star, but with no known hot stars in the field of view.
• Document is unclassified; internal NASA debrief transcript.

Source: Pages 2–3 transcript (Henry, CONT’D).

Key Observations

• “We looked for Lyman-alpha radiation, red shifted from the ionized hydrogen, and we didn’t see any… . I think that may leave a real mystery as to what is holding the thing together.”
• “The spectrum that we see looks like the spectrum of the hot star; however, we know that there were no hot stars within our field of view. Therefore, the most conservative interpretation, I think, is that what we’re seeing is light from hot stars in the galac[tic] …”

Source: Pages 2 and 3 (Henry, CONT’D).

Context & Significance

This is a standard post-mission scientific debrief, not a UAP-specific investigation. At the time, Apollo 17 carried instruments for astronomical observations from the lunar module or command module, and the crew reported unexpected astrophysical results. The anomalies described—missing binding mass in Coma and an unexplained UV glow—were early inputs to discussions about dark matter and the extragalactic background light. No UAP sightings or anomalous craft are mentioned. The document illustrates how space missions occasionally recorded unexplained astrophysical signals that later prompted further research.

Source: Scientific content of pages 2–3; metadata indicates routine NASA debrief.

Evidence Assessment

What this document shows:

• Astronauts reported an astrophysical mystery (Coma cluster mass discrepancy) and an unidentified UV spectral feature resembling a hot star but without any identifiable source.

What this document does NOT show:

• No confirmation of extraterrestrial origin or technology.
• No definitive identification of observed phenomena.
• No UAP sightings, encounters, or physical objects.
• Independent analysis should refer to the original document.

[WARN] Assessment: The document contains no evidence of UAP; the observations are purely astrophysical and were described in terms of known scientific questions (missing mass, diffuse UV background). The “mystery” pertains to gravitational binding and unidentified light sources, not to anomalous craft or non-human intelligence.