To Cosmology - Introduction

Cosmology shifts our perspective from the local to the infinite. It reveals a universe that is dynamic, evolving, and largely invisible. While we have mapped the history of the cosmos back to its earliest seconds, the nature of dark energy and the exact mechanism of the Big Bang remain the great frontiers of modern science.

Evidence for this theory is overwhelming, most notably the radiation. Discovered in 1964, the CMB is the "afterglow" of the Big Bang—faint radio signals coming from every direction in the sky, representing the moment the universe cooled enough for light to travel freely. 3. The Composition of the Cosmos Introduction to Cosmology

One of the most surprising realizations in cosmology is that the atoms that make up stars, planets, and people account for only about 5% of the universe. The rest is composed of two mysterious substances: Cosmology shifts our perspective from the local to

A repulsive force that appears to be accelerating the expansion of the universe, pushing galaxies apart at an increasing rate. 4. The Fate of the Universe Evidence for this theory is overwhelming, most notably

An invisible form of matter that does not emit light but exerts gravitational pull, holding galaxies together.