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.
The Solar System is the gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly.
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.
Derived from Latin albedo “whiteness” (or reflected sunlight) Albedo is the diffuse reflectivity or reflecting power of a surface.
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.