The Earth Similarity Index (ESI) is a proposed characterization of how similar a planetary-mass object or natural satellite is to Earth. It was designed to be a scale from 0.0 to 1.0, with Earth having a value of 1.0; this is meant to simplify planet comparisons from large databases.

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The Solar System is the gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly.

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A debris disk is a circumstellar disk of dust and debris in orbit around a star. Debris disks have been found around both mature and young stars, as well as at least one debris disk in orbit around an evolved neutron star.

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Albedo

cosmopedia planets

Derived from Latin albedo “whiteness” (or reflected sunlight) Albedo is the diffuse reflectivity or reflecting power of a surface.

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The greenhouse effect is the process by which radiation from a planet’s atmosphere warms the planet’s surface to a temperature above what it would be without its atmosphere.

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