4. Our Universe is an energetically bound Cosmic Hierarchy of different objects.

4. Our Universe is an energetically bound Cosmic Hierarchy of different objects.

Our observable Universe is an energetically bound hierarchy of cosmic objects, from single stars and planetary systems (with their dimensions below one light-year) to the observable limit of our telescopes, discovering objects as large as the Sloan Great Attractor (with their dimensions above 3.5 milliard light-years).