taevakehasid

Taevakehasid, commonly referred to as celestial bodies, are natural objects located outside of Earth's atmosphere. This broad category encompasses a vast array of astronomical entities, each with unique characteristics and origins.

Stars, such as our Sun, are massive, luminous spheres of plasma held together by their own gravity. They generate energy through nuclear fusion in their cores. Planets are celestial bodies that orbit a star, are massive enough for their self-gravity to overcome rigid body forces so that they assume a hydrostatic equilibrium (nearly round) shape, and have cleared the neighborhood around their orbit. Moons, or natural satellites, orbit planets or dwarf planets.

Asteroids are rocky, airless worlds that orbit the Sun but are too small to be called planets. Comets are icy bodies that release gas or dust. Dwarf planets, like Pluto, meet some but not all of the criteria for being classified as planets. Galaxies are vast systems of stars, stellar remnants, interstellar gas, dust, and dark matter, all bound together by gravity. Nebulae are clouds of interstellar gas and dust, often serving as stellar nurseries.

Understanding taevakehasid is fundamental to astronomy and cosmology, providing insights into the formation and evolution of the universe, the potential for extraterrestrial life, and our place within the cosmos. Their study relies on observations from telescopes and space probes, as well as theoretical modeling.