Albedo is the rate of reflection of the star's rays by the orbital object.

More this one have an high albedo, more it will reflect the rays of its star to the space, and less the soil will have to absorb heat.

The nature of the ground influence directly the albedo; for example a large glacial zone will strongly reflect the rays.

Example: Venus has an albedo of about 0.72 that's to say 72%.

Extrasolar System:

Describe any star system / stellar system and planetary system other than the Solar System.

Orbit Distance:

Average orbit distance of an orbital object from it's star, or of a satellite from its main orbital object.

This distance is expressed in AU (Astronomical Units) or in Km (kilometers).

Example: Saturn is at 9.54 AU from The Sun.

Orbital Eccentricity:

The orbital eccentricity of an orbital object indicate the shape of this one.

Higher this value (which is a float number 0 < x < 1) is, more the orbit will be elliptical, which can cause significant changes of surface seasonal temperature.

Example: Pluto has an eccentricity of 0.2488.

Orbital Object:

Generic term for a planet and an asteroid.

Planetary System:

A star with at least one orbital object.

Star System:

Refers to a star or a system of two to three stars in the game.

Star Temperature:

In astrophysics, the star surface temperature is in Kelvin degrees.

The zero Kelvin degree is the absolute zero which in centigrade degrees is -273.15°C

Example: the temperature of the The Sun is 5570K.

Stellar System:

cf. Star System.

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