Hint: The universe encompasses all of space and time, as well as their contents, which include planets, stars, galaxies, and all other forms of matter and energy. The Big Bang Theory is the most widely accepted cosmological explanation for the evolution of the universe.
A celestial object, also known as an astronomical object, is a naturally occurring physical entity, association, or structure that exists in the observable universe. The terms object and body are frequently used interchangeably in astronomy. An astronomical body or celestial body, on the other hand, is a single, tightly bound, contiguous entity, whereas an astronomical or celestial object is a complex, a less cohesively bound structure that may consist of multiple bodies or other objects with substructures.
Astronomical objects include planetary systems, star clusters, nebulae, and galaxies, while astronomical bodies include asteroids, moons, planets, and stars. A comet can be classified as both a body and an object: a body when referring to the frozen nucleus of ice and dust, and an object when referring to the entire comet, including its diffuse coma and tail.
There is a hierarchical structure to the universe. The galaxy is the fundamental component of assembly at the largest scales. Galaxies are organized into groups and clusters, which are often within larger superclusters, and are strung along vast filaments between nearly empty voids, forming a web that spans the observable universe.
Thus, Celestial refers to anything that exists outside of the Earth's atmosphere. Celestial refers to any natural body that exists outside of the Earth. Planets, the sun, and the moon are examples of celestial bodies.
Note: Galaxies have a variety of morphologies, including irregular, elliptical, and disk-like shapes, depending on their formation and evolutionary histories, which include interactions with other galaxies that may result in a merger. Disc galaxies are lenticular and spiral galaxies that have features like spiral arms and a distinct halo. Most galaxies have a supermassive black hole at their core, which can result in an active galactic nucleus. Dwarf galaxies and globular clusters are examples of satellite galaxies.