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Venus
Solar System
A terrestrial boundary case whose runaway greenhouse climate defines a critical limit on planetary habitability.
AEvidence classDirectly observed or repeatedly measured
- Mean radius
- 6,051.8 km
- Surface gravity
- 8.87 m/s²
- Representative temperature
- about +464 °C surface
- Surface pressure
- about 92,000 mbar
Scientific assessment
The surface is sterile by known standards; the cloud-layer habitability hypothesis remains unconfirmed and requires direct chemical measurements.
- Liquid-water evidence
- No stable surface water; ancient water history unresolved
- Principal constraint
- Extreme heat, pressure, and corrosive atmosphere
- Principal mission context
- Magellan archive; DAVINCI, VERITAS, EnVision
Comparative evidence matrix
A transparent research-priority index, not a probability of life. It combines solvent evidence, usable energy, chemistry, environmental stability, evidence maturity, and sampling access.