Lubadus

Lubadus is a fictional terrestrial exoplanet that appears in science fiction literature and in educational exercises about planetary habitability. In most in-universe depictions, Lubadus orbits a K-type main-sequence star within the imagined Lubadon system. It is described as a compact rocky world with a radius close to 0.92 times that of Earth and a mass about 0.8 Earth masses, yielding a density similar to Earth and a gravity only modestly weaker than our planet. Its orbit places it near 0.9 astronomical units from its star, producing a temperate insolation regime conducive to stable climates and liquid water.

Geography and climate are central features in the canonical portrayals. Lubadus is said to have a global ocean covering roughly 60 percent of the surface, with several large continents and archipelagos. An axial tilt near 22 degrees gives seasonal variation, while a modest greenhouse effect helps maintain a temperate climate overall. The atmosphere is described as Earthlike in composition, supporting weather systems ranging from trade-winds to mid-latitude cyclones. Weather and ocean currents are frequently used in the fiction to illustrate climate dynamics on ocean-dominated planets.

Biosphere and human presence vary by work, but most depictions include microbial life in oceans and coastal ecosystems, with speculative multicellular life in some regions. In some stories, scientists establish research outposts or automated stations to study climate, geology, and potential habitability. Lubadus is often cited as a case study in exoplanet habitability modeling and the influence of ocean coverage on climate stability. Etymology typically links the name to mythic or scholarly notions of learning and endurance.