Intelligent Design Investigation

Explore the Evidence

A Habitable Earth  •  12 evidence records
A Visit With Jesus

This investigation draws upon 12 related evidence records. They are grouped below according to the part of the investigation they help us examine. Select any record for a closer look at the observation, scientific background, significance, uncertainties, and its relevance to Intelligent Design.

A Suitable Star and Orbit

Planetary Condition

Earth Within the Sun's Habitable Zone

Earth orbits the Sun within a region where conditions can allow liquid water to remain on a planet's surface. This habitable zone is important, but distance from a star is only the beginning of the habitability question.
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Stellar Condition

The Sun as Earth's Host Star

Earth receives its light and energy from a long-lived main-sequence star whose properties have allowed habitable conditions to persist for billions of years.
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Planetary Condition

Earth's Orbit and Rotation

Earth follows a nearly circular orbit and rotates approximately once every 24 hours, producing regular cycles of sunlight and darkness across most of the planet.
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Water and Atmosphere

Planetary Condition

Liquid Water and Earth's Oceans

Earth possesses enormous quantities of liquid surface water, and every known form of life depends upon liquid water.
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Planetary Condition

Earth's Atmosphere and Surface Conditions

Earth's atmosphere provides pressure, climate regulation, useful gases, and protection while allowing liquid water to remain widespread at the surface.
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Long-Term Climate

Planetary System

The Carbon Cycle and Long-Term Climate

Carbon moves among Earth's atmosphere, oceans, living things, rocks, and interior. Geological processes can influence atmospheric carbon dioxide and climate over very long timescales.
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The Right Kind of Planet

Planetary Condition

Earth's Mass, Gravity, and Rocky Composition

Earth is a rocky planet whose mass, gravity, composition, atmosphere, and interior have developed together. These properties strongly affect habitability, although Earth's exact size and mass are not known to be uniquely required.
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Planetary System

Earth's Magnetic Field

Earth's moving metallic interior generates a global magnetic field that strongly affects how the planet interacts with the solar wind. Its role in atmospheric protection and habitability is important to investigate, but more complicated than the simple idea of a magnetic shield.
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Planetary System

Plate Tectonics and Geological Activity

Earth's moving tectonic plates connect its surface, oceans, atmosphere, crust, and mantle. These processes influence long-term climate and chemical cycling, although scientists have not established that plate tectonics is an absolute requirement for life.
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A Planetary System

Planetary System

The Moon and Earth's Environment

Earth has a large Moon that has strongly influenced tides, Earth's rotation, and the history of the Earth-Moon system. Its contribution is significant, but current research does not show that a large moon is required for an Earth-like planet to remain habitable.
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Materials for Life

Planetary Condition

Earth's Chemical Inventory

Earth contains the chemical elements and compounds needed to build complex living systems, together with geological and biological cycles that continually redistribute many of them.
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Putting the Pieces Together

Integrated System

The Combined Requirements for Complex Life

Earth's habitability results from many interacting systems rather than from one remarkable property. The larger question is how a suitable star, orbit, water, atmosphere, chemistry, planetary structure, climate, and geological history work together over time.
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  Evidence records distinguish observations from proposed explanations and areas that remain uncertain.