Cosmology
Cosmology is the scientific study of the origin, structure, and evolution of the universe as a whole. It combines observations from astronomy and physics to develop models explaining how the universe began, how it has changed over time, and what its ultimate fate may be. Modern cosmology relies on empirical evidence gathered through telescopes and other instruments, combined with theoretical frameworks from physics, to understand the cosmos on the largest scales.
Key Areas of Investigation
Cosmologists investigate fundamental questions about the universe, including its age, size, and composition. They study the cosmic microwave background radiation, which provides evidence of the universe’s earliest states, and observe distant galaxies to understand large-scale structure and expansion. The field also examines dark matter and dark energy, which together account for approximately 95% of the universe’s content but remain poorly understood.
Theoretical Foundation
Modern cosmology is built primarily on general relativity, Einstein’s theory of gravity, which describes how massive objects curve space and time. The Big Bang theory, supported by multiple independent lines of evidence, provides the standard model for cosmic history. Alternative models and extensions to this framework continue to be developed as new observational data emerges and as physicists work to reconcile general relativity with quantum mechanics at the universe’s earliest moments.