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the claim
Outer space is radioactive
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
7 sources for · 0 against

Multiple studies and space missions confirm that outer space contains pervasive ionizing radiation, including galactic cosmic rays and solar energetic particles, presenting significant hazards to spacecraft and human health.

Evidence for · 7
Space radiation quality factor for Galactic Cosmic Rays and typical space mission scenarios using a microdosimetric approach
2023 · cited by 23
Discusses galactic cosmic rays and space radiation exposure risks in interplanetary space due to the lack of protective atmospheric and magnetic shielding.
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The analysis

The claim is specific and empirically verifiable. The provided papers consistently document the presence of galactic cosmic rays, solar energetic particles, and overall ionizing radiation throughout interplanetary and cis-lunar space, heavily supporting the statement that outer space is radioactive.

More for · 6
Induced Torpor as a Countermeasure for Low Dose Radiation Exposure in a Zebrafish Model
2021 · cited by 9
Notes that long-term space travel exposes travelers to ionizing radiation from galactic cosmic rays and solar particle events, creating health hazards.
Space Travel: The Radiation and Microgravity Effects on the Cardiovascular System.
2024 · cited by 8
Explains that the heart and cardiovascular system are subject to radio-degenerative effects when exposed to radiation in space.
Galactic Cosmic Rays and Solar Energetic Particles in Cis-Lunar Space
2022 · cited by 4
Examines how galactic cosmic rays and solar energetic particles create a dynamic and varying radiation environment in cis-lunar space.
Study of radiation shielding efficacy of polyethylene and polyethylene-based composite against galactic cosmic rays and secondary neutrons
2025 · cited by 3
Focuses on spacecraft radiation shielding against interplanetary and galactic cosmic ray radiation environments beyond low Earth orbit.
Time-Dependent Radiation Quality Factorof Galactic Cosmic Rays in Deep Space and Shielding Environments: Modeling and Measurements
2025 · cited by 1
Models the galactic cosmic ray radiation environment and energy transfer spectra in deep space and shielding environments.
Simulations of Radiological Dose Quantities in Astronauts During Solar Energetic Particle Events Across Modern Space History
2026 · cited by 1
Analyzes the significant radiation doses received by astronauts from solar particle events during space missions.
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → SUPPORTED · 8404 Aug 2026
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