A mainstream hypothesis: the boulders are natural concretions and/or differential cementation remnants
Claim about Valley of the Planets (Wan Tikofi / Wadi al-Kawakeb) · Stance: supporting
One evidence-first interpretation is that the rounded/discoidal forms arise from concretion growth and subsequent erosion of surrounding host rock, similar to other concretion fields worldwide.
Site
Evidence for and against
- Scientific Reports model for sedimentary concretion growth
- Kentucky Geological Survey: what concretions are (public explainer)
- North Dakota Geological Survey: Cannonball concretions
- Calcareous tufa record from Tadrart Acacus (Holocene hydrology proxy)
Other claims about Valley of the Planets (Wan Tikofi / Wadi al-Kawakeb)
- A remote Libyan valley is popularly known as the 'Valley of the Planets' for its rounded/discoidal boulders
- The valley is usually described within the broader Tadrart Acacus (Akakus) landscape context
- Another mainstream mechanism: weathering/exfoliation can produce smooth, rounded 'onion-skin' surfaces
- ‘Living stones’ claims are popular, but evidence for motion/growth at this site is weak
- Attribution to NASA ('NASA explored/identified it') is often asserted but rarely documented with primary references
- Alternative hypothesis: the boulders were shaped or arranged by people (disputed)
- Alternative hypothesis: the boulders are evidence of extraterrestrial activity (disputed)
- Meta-claim: there appears to be little peer‑reviewed work focused specifically on this boulder field
- Holocene lakes and wet phases could have influenced weathering/cementation processes (contextual, not proven)