Goldilocks zone
Not-too-hot orbit
The Goldilocks zone is a range of conditions that are neither too extreme in one direction nor too extreme in the other—just right, like the porridge in the fairy tale.
In astronomy, it refers to the orbital distance from a star where liquid water could exist on a planet's surface: Earth sits squarely in the sun's Goldilocks zone.
The term extends to any situation requiring a precise middle ground: Interest rates need to hit the Goldilocks zone—high enough to control inflation, low enough to sustain growth.
Surrounding a star
- exoplanetPlanet outside our system
- liquid waterH2O in flowing state
- astrobiologyStudy of cosmic organisms
- biosignaturesDetectable signs of life
red dwarf · planetary system · SETI · spectroscopy · Europa · Enceladus · Mars
H2O in flowing state
- atmosphereGaseous layer around planets
- biosphereAll life on Earth
- oxygenElement eight, colorless gas
- carbon dioxideRespiration byproduct, photosynthesis fuel
photosynthesis · ecosystem · biodiversity · climate · terraforming · microorganisms · flora · fauna
Exactly as needed
- optimalMost desirable outcome
- perfectWithout any flaw
- balancedIn a state of equilibrium
- sweet spotOptimal point or area
not too cold · suitable · appropriate · fitting · precise · comfortable · favorable · harmonious
circumstellar
Surrounding a star
- exoplanetPlanet outside our system
- liquid waterH2O in flowing state
- astrobiologyStudy of cosmic organisms
biosignatures · red dwarf · planetary system · SETI · spectroscopy · Europa · Enceladus · Mars
liquid water
H2O in flowing state
- atmosphereGaseous layer around planets
- biosphereAll life on Earth
- oxygenElement eight, colorless gas
carbon dioxide · photosynthesis · ecosystem · biodiversity · climate · terraforming · microorganisms · flora · fauna · soil
just right
Exactly as needed
sweet spot · not too cold · suitable · appropriate · fitting · precise · comfortable · favorable · harmonious · fine-tuned
moderate
Lessen intensity or preside
equable · climate · warm · cool · springlike · gentle · seasonal · comfortable · livable · clement
- spacespace, sun, moon, stars, star
- Alien Lifeextraterrestrial life, extraterrestrial intelligence, alien intelligence, first contact, biosignatures
- Space Regionsasteroid belt, Kuiper belt, Oort cloud, heliosphere, interplanetary space
- planetsEarth, planets, Mars, Jupiter, Saturn
- Extraterrestrialsalien, aliens, extraterrestrial, ET, UFO
- cosmic modelsorrery, planetarium, solar system model, celestial sphere, armillary sphere
Goldilocks zonedead zone
Area lacking signal coverage
hostile environment · exclusion zone · kill zone · wasteland
Goldilocks zonedanger zone
High-risk location
red zone · too much · too little · excess · deficiency