Quote Investigator traces changing forms and credits. Its 1996 Santa Fe New Mexican example, written by Newsweek journalist Rick Marin, credits Clarke with this wording, but its origin conclusion remains uncertain.
“Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying” — Attributed to Arthur C. Clarke; origin and exact primary source unconfirmed.
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Evoking the world of Arthur C. Clarke — British science-fiction writer. Theme: "Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.
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Minimalist editorial slide for the quote "Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying". Clean background, a single muted accent color, generous negative space, subtle paper or linen texture, no literal illustration — let the words carry it. Reserve clear space for a serif quote and a small credit line. No lettering in the image itself.
Provenance
The source
Evidence
Later credit, uncertain origin
Verdict
Attributed
Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying
Short identifying wording under investigation; not a claim that a primary original was inspected.
Quote Investigator traces changing forms and credits. Its 1996 Santa Fe New Mexican example, written by Newsweek journalist Rick Marin, credits Clarke with this wording, but its origin conclusion remains uncertain. Quote Investigator: changing attributions ↗
The quoted 1996 report is modern; the ultimate author and rights holder of the aphorism are not established.
Rights status is our research, not legal advice — and copyright varies by country and edition. For commercial or published use, confirm with the rightsholder. See terms.
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Arthur C. Clarke wrote science fiction and essays about technology. His work connected imagined futures with questions about science.
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The evidence consulted
Quote Investigator: changing attributions. Consulted 9 November 2026. https://quoteinvestigator.com/2020/10/22/alone/
This verification page
Quotle.info. “Who really said ‘Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying’?” Last verified 9 Nov 2026. https://quotle.info/who-said/two-possibilities-exist-either-we-are-alone-in-the-universe/