An astronomical object, celestial object, stellar object or heavenly body is a naturally occurring physical entity, association, or structure that exists within the observable universe. In astronomy, the terms object and … See more

The universe can be viewed as having a hierarchical structure. At the largest scales, the fundamental component of assembly is the galaxy. Galaxies are organized into groups and clusters, often within larger superclusters, that are strung along great See more

The IAU definitions of planet and dwarf planet require that a Sun-orbiting astronomical body has undergone the rounding process to reach a roughly spherical shape, an achievement known as hydrostatic equilibrium. The same spheroidal See more

Astronomical objects such as stars, planets, nebulae, asteroids and comets have been observed for thousands of years, although early cultures thought of these bodies as See more

The constituents of a galaxy are formed out of gaseous matter that assembles through gravitational self-attraction in a hierarchical manner. … See more

• Astronomy portal
• List of light sources
• List of Solar System objects
• List of Solar System objects by size
• Lists of astronomical objects See more

• SkyChart, Sky & Telescope at the Library of Congress Web Archives (archived 2005-06-13)
• Monthly skymaps for every location on Earth. Archived 2007-09-13 at the Wayback Machine. See more