Meaning “shaped as a planet”, the term planetoid refers to a (small) celestial body possessing some planet characteristics, notably its almost spherical shape, but not the size. It’s also called “dwarf planet” or “minor planet”. Matching … Lire la suite... |
Dico S.F. – Planet
In astronomy, a planet is a celestial body orbiting around the Sun and possessing a sufficient mass for its own gravity gives it a (almost) spherical shape. In science fiction, this term is generalised to every celestial body matching the … Lire la suite... |
Dico S.F. – Meteorite
A meteorite designates a small celestial body which reaches the Earth surface. To properly speak about meteorite, its size must be under fifty meters (beyond that, we speak about asteroid). The luminous trail leaved behind by a meteorite during its … Lire la suite... |
Dico S.F. – Exoplanet
An exoplanet designates a planet gravitating around a star different than our Sun. See: Planet… Lire la suite... |
Dico S.F. – Comet
A comet is a small celestial body gravitating around a star on a very elliptical orbit (unlike the asteroids). During its travel, it approaches very close to the star and, under the solar wind effect, adorns with a luminous trail … Lire la suite... |
Dico S.F. – Asteroid
An asteroid is a small celestial body (between several dozens meters and several hundreds of kilometres) gravitating around a star on an faintly elliptical orbit (unlike the comets). Asteroids are solitary and don’t orbit around planets. The more often, the … Lire la suite... |
Dico S.F. – Antimatter
In physics, antimatter is a generic term designating particles which have the same properties than their “normal” matter counterparts, except their electric charge. For instance, the electron’s antiparticle, the positron, possess a positive charge whereas the electron possess a … Lire la suite... |
Dico S.F. – Positronic
In the field of physics, positronic is an adjective referring to the electron antiparticle, the positron (which possess the same physical properties than the electron except his charge that is the opposite). In science fiction, this term has been introduced … Lire la suite... |
Dico S.F. – Terraforming
The terraforming is a process by which the ecosystem (atmosphere, vegetation…) of a planet or exoplanet is transformed to be suitable to human life. This process takes generally several centuries. The official (and more general) term for terraforming is “… Lire la suite... |
Dico S.F. – Galaxy
In the field of astronomy, a galaxy is a gathering (of a size superior to 200 parsecs) of billions of stars bounded by gravitational forces.
Matching words: Star, Star cluster In the movie Men in Black II directed… Lire la suite... |
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