Here's a breakdown of what cosmology encompasses:

* Origins and Evolution: Cosmology investigates the origin, evolution, and structure of the universe as a whole.

* Cosmic Microwave Background: It studies the faint afterglow of the Big Bang, the cosmic microwave background radiation, to understand the early universe.

* Galaxies, Stars, and Planets: Cosmology investigates the formation and evolution of galaxies, stars, and planets within the universe.

* Dark Matter and Dark Energy: It explores the mysterious dark matter and dark energy that make up a large portion of the universe's mass and energy.

* Spacetime and Gravity: Cosmology delves into the nature of spacetime and the theory of gravity, including Einstein's theory of General Relativity.

Related fields:

* Astrophysics: Deals with the physics of celestial objects and phenomena.

* Astrobiology: Focuses on the possibility of life beyond Earth.

* Particle Physics: Studies the fundamental building blocks of matter and their interactions.

* Astronomy: Uses telescopes and other instruments to observe celestial objects.

Cosmology is a fascinating and ever-evolving field that aims to answer fundamental questions about the universe we live in.