Luminarys

Luminarys are celestial bodies that emit light. The most familiar examples are stars, which are massive, luminous spheres of plasma held together by their own gravity. Stars generate energy through nuclear fusion in their cores, primarily converting hydrogen into helium. This process releases vast amounts of light and heat that travel across space.

The Sun, our own star, is a prime example of a luminary and is essential for life on Earth. Other luminaries visible from Earth include planets, which are also celestial bodies but do not produce their own light. Instead, they reflect the light of stars, most notably our Sun. Planets appear as bright, steady points of light in the night sky, distinguishing them from stars, which often appear to twinkle due to atmospheric distortions.

The concept of luminaries also extends to artificial light sources created by humans. These include lamps, light bulbs, and other devices designed to illuminate. While not celestial, these artificial luminaries serve a similar purpose of providing light for various applications, from everyday illumination to specialized scientific and industrial uses. The study of luminaries, both natural and artificial, is a fundamental aspect of astronomy, physics, and engineering.