Parallel Worlds

Introduction: The Discovery of the Big Bang

For centuries, human understanding of the origin of existence was divided between two conflicting ideas. One perspective, common in many Western traditions, suggests the universe had a specific moment of creation, beginning from nothing. The other, found in various Eastern traditions, views the universe as timeless, having no beginning or end. Modern science is beginning to show that both of these seemingly contradictory ideas may be true at the same time.

The journey toward understanding the origin of everything began with individuals who looked beyond the Milky Way. Edwin Hubble fundamentally changed our map of the cosmos in the 1920s by proving that Andromeda was a separate galaxy. He used the Doppler effect to observe that distant galaxies were moving away from Earth, and the farther away they were, the faster they were receding. This provided the first observational evidence that the universe is expanding, implying that everything originally expanded from a single, dense point.

The idea of a sudden beginning was initially met with heavy skepticism. George Gamow proposed that an intense initial explosion acted as a furnace that forged the chemical elements we see today. Fred Hoyle strongly opposed this idea, preferring a steady state model, and mockingly referred to the sudden creation theory as a big bang. Ironically, Hoyle later proved that heavy elements are actually made inside the cores of stars, but the memorable name for the explosion theory stuck permanently.

Gamow predicted that if the universe began in a hot explosion, a faint afterglow of radiation should still fill all of space. In 1965, two engineers named Arno Penzias and Robert Wilson accidentally detected a persistent background hiss using a sensitive radio telescope. They realized they had found the cosmic microwave background radiation, a uniform glow appearing in every direction. This discovery provided the definitive proof that the initial explosion had actually occurred.

Modern tools like the WMAP satellite later captured this radiation from exactly 380,000 years after the universe began, dating the cosmos to 13.7 billion years old. This data also revealed a humbling truth about the composition of our world. Visible matter makes up only 4 percent of the universe, while the rest consists of invisible dark matter and dark energy. Dark energy acts as a kind of antigravity, pushing the universe apart at an accelerating rate.

While our specific universe had a definite starting point, the larger arena it exists in might be eternal. Creation events could be happening constantly, forming a vast collection of universes known as the multiverse. This synthesis allows for the sudden birth described in ancient myths to occur repeatedly within a permanent, unchanging background.