Manadagr

Manadagr is a fictional exoplanet used in speculative astronomy and science fiction to illustrate questions of habitability and planetary detection. In commonly cited depictions, it orbits a sun‑like star in a fictional system within the Orion Arm. The planet is described as rocky and temperate, with a radius about 1.1 Earth radii and a mass around 1.3 Earth masses, resulting in a surface gravity near 1.2 g.

Orbit and physical characteristics are outlined as a near-circular orbit with a semi-major axis close to 0.95 astronomical units and an orbital period of roughly 320 to 340 days. The atmosphere is modeled as nitrogen‑dominated, with a trace amount of carbon dioxide and a small fraction of oxygen, producing a modest greenhouse effect and an average surface temperature near 290 Kelvin. Weather patterns and cloud cover are used in examples of climate modeling and atmospheric spectroscopy.

Geographically, Manadagr is described as having two sizable continents and several archipelagos, with oceans covering about 40 percent of the surface. Notable features in the fictional geography include a broad basin called Mira Basin and a mountain chain named Orion Ridge. Geological activity is typically described as moderate plate tectonics with intermittent volcanism, contributing to a dynamic surface environment in some narratives.

Life and exploration discussions on Manadagr focus on the potential for microbial ecosystems in subsurface or shallow-water environments, though no confirmed biosignatures are asserted in standard depictions. The planet is frequently employed in teaching about transit and radial‑velocity detection methods, atmospheric characterization by spectroscopy, and habitability assessment, serving as a pedagogical tool rather than a real-world object.