Cosmodex

Cosmodex is an educational solar system atlas designed to make astronomy approachable and useful for curious learners and skywatchers. Its website brings together information about the planets, the Moon, stars, and constellations, supported by interactive visualizations and referenced astronomical data. Visitors can explore profiles of the eight planets and dwarf planet Pluto, compare planetary characteristics, and learn about notable stars, including their distance, magnitude, and spectral class. The site also covers all 88 IAU-recognized constellations, with information about their mythology, brightest stars, and visibility.

Cosmodex offers practical observing tools alongside its educational content. Users can check the current Moon phase, browse lunar details and a full Moon calendar, and consult guidance for tonight’s sky. Planet comparison features help illustrate differences in size and other characteristics, while searchable navigation makes the atlas easier to explore. The site describes its astronomical data as sourced from NASA, ESA, and public astronomical databases. With its blend of reference material and skywatching resources, Cosmodex serves as a convenient destination for exploring the solar system and planning an interest in the night sky.