The Claim
This Investigation tests the historical version advanced by Velikovsky: Venus is alleged to have been expelled from Jupiter within recorded human history. It does not test arbitrary, unspecified events at the formation of the Solar System.
Where It Comes From
Velikovsky made the Jovian origin of Venus a central step in Worlds in Collision. In his reconstruction, the newly ejected body behaved like a comet before later encounters and orbital settling.
Why It Sounds Convincing
Planetary ejections are not meaningless physics. Violent interactions occur in young planetary systems, and impacts shape planets. That makes a dramatic origin sound less arbitrary than it is when the required chronology and composition are omitted.
The Short Answer
The evidence contradicts the Claim. Venus is a differentiated rocky terrestrial planet (a planet whose interior separated into layers of different materials) whose formation and long evolution belong to the early Solar System. Multiple independent records are incompatible with a planet created from Jupiter in recorded or near-recorded human history.
How It Would Have to Work
A Jovian-ejection model must explain how enough material escapes Jupiter, loses enormous orbital energy, becomes a roughly Earth-sized rocky differentiated planet, acquires Venus’s isotopic inventory and reaches its current low-eccentricity orbit without leaving the expected disruption in the rest of the Solar System.
What Actually Happens
Modern formation models instead build the terrestrial planets from solids in the inner protoplanetary disk. Later impacts can strongly modify them, but this is not equivalent to expelling a mature terrestrial planet from a gas giant.
What the Evidence Shows
The pivotal question is when, not just whether the early Solar System ever experienced violent impacts or scattering. The 2025 review by Marchi and Korenaga places the terrestrial planets, including Venus, in an accretionary early-Solar-System framework. Its frequently quoted 60–100-million-year estimate of growth refers to Earth, not a directly measured age of Venus. Venusian volcanism and resurfacing likewise point to long geological evolution, not creation from Jupiter in the last few thousand years.
There is a material qualification to the isotope evidence. Avice and colleagues’ 2022 review says existing Venus atmospheric noble-gas abundances and isotope ratios are not precise enough to draw firm conclusions about Venus’s origin or its atmosphere. Those data are an interesting research direction, not standalone proof that Jupiter was not the source. The historical Jovian ejection instead requires a credible rock-planet formation mechanism and a dated dynamical history consistent with the observed inner Solar System.
The Strongest Evidence for the Claim
Violent scattering and planet-scale impacts are physically meaningful processes in planetary formation. Their existence means that simply declaring planetary ejection impossible would be a poor objection. Yet no inspected source demonstrates the specific historical step of generating a Venus-sized rocky planet from Jupiter.
The Strongest Evidence Against It
The proposed historical event would have to account for Venus’s terrestrial structure, geological evolution and present orbit while leaving a coherent trajectory for the rest of the inner Solar System. Early accretion is a broad evidence-based alternative; no source documents the required late Jovian ejection. Avice’s isotope caveat is retained rather than concealed.
Common Viral Arguments
“Planets can be ejected, therefore Jupiter could have ejected Venus” confuses a broad dynamical possibility with a particular history. “Venus has unusual properties” does not identify Jupiter as their source.
The Reasoning Error
Mechanism neglect matters because the narrative skips the quantitative energy and material constraints between “ejection” and the present planet. Possibility–probability confusion appears when rare dynamical phenomena are treated as evidence that this specific event occurred.
What Would Change Our Conclusion?
A viable change would require a quantitative dynamical model reproducing Venus’s present orbit and composition from a Jovian ejection, together with independent chronological and geochemical signatures of that event.
Evidence Status
Status: Contradicted
Evidence quality: High
Contradicted for the explicitly historical hypothesis. The working High evidence-quality assessment rests on the joint early-formation and dynamical chronology, not on definitive Venus-atmosphere isotope provenance measurements.
Evidence & Sources
The central sources are modern reviews and measurements of terrestrial-planet formation and Venus evolution. They test the physical history; Velikovsky’s book is kept separately as Claim Provenance.
Corrections & Updates
October 10, 2026 — scope clarification and evidence correction: Explicitly narrowed the historical Jovian-ejection Claim and corrected the overstatement of Venus isotope origin evidence. The conclusion has not been changed.
Last Reviewed
October 10, 2026.