Universum is a free astronomy portal created by Steve Cimolino to make the night sky accessible to curious beginners, families, and experienced enthusiasts. It brings together interactive tools, illustrated resources, and learning materials to help visitors explore the Solar System, the Moon, planets, constellations, galaxies, and other celestial objects. Its interactive planetarium and sky atlases support discovery, while observation tools help users identify what to see, plan an outing around their location and equipment, and record sessions in an observation journal.

The site also offers astronomy guides and books that can be read online or downloaded as free PDFs, covering topics from getting started with stargazing to astrophysics and creating a scaled Solar System walk. Visitors can explore astronomy calendars, telescope information, scientific catalogues, and educational features on subjects such as orbits, star colors, and the history of astronomy. Universum is available without an account and encourages people to learn at their own pace, connect knowledge with practical observing, and share their curiosity about the universe