part of universe sciencetific theory

Galaxies: A galaxy is a collection of stars, dust, and gas held together by gravity. There are different types of galaxies, such as spiral, elliptical, and irregular. The Milky Way, which is the galaxy we are in, is a spiral galaxy.

Stars: Stars are celestial bodies that emit light and heat due to nuclear reactions taking place in their cores. They come in different sizes, colors, and temperatures. The Sun, which is the closest star to Earth, is a medium-sized star.

Planets: Planets are celestial bodies that orbit around stars. They can be divided into two categories, terrestrial planets and gas giants. Earth, Mars, Venus, and Mercury are terrestrial planets, while Jupiter, Saturn, Uranus, and Neptune are gas giants.

Moons: Moons are celestial bodies that orbit around planets. Earth has one moon while Jupiter has 79 known moons.

Asteroids and comets: Asteroids are small rocky bodies that orbit around the Sun, while comets are made up of ice, dust, and rock.

Dark matter and dark energy: These are invisible forms of matter and energy that make up the majority of the universe's mass. Scientists have inferred their existence from gravitational effects on visible matter, but have not directly detected them yet.

Cosmic microwave background radiation: This is the faint afterglow of the Big Bang, the event that is thought to have marked the beginning of the universe.

All these parts are constantly interacting and influencing each other, creating a complex and dynamic system that is the universe.