2 days ago · The most widely accepted explanation for the origin of the universe is the big-bang theory, which proposes that the universe began approximately 13.8 billion years ago in an …

Discoveries in the early 20th century lead to the Big Bang theory with a hot fireball, cooling and becoming less dense as the universe expanded, allowing the first subatomic particles and …

Jul 17, 2025 · They hope to uncover clues about what happened in the universe’s first moments to create the varied, textured universe we inhabit today. According to the leading theory, the …

Jan 18, 2017 · How did the universe begin—and what were its early days like? The most popular theory of our universe's origin centers on a cosmic cataclysm unmatched in all of history—the …

Jul 26, 2025 · The story of how the universe began is the story of how everything came to be. It is not just the domain of physicists and philosophers, but a tale that pulses in the blood of every …

The Big Bang was the moment 13.8 billion years ago when the universe began as a tiny, dense, fireball that exploded. Most astronomers use the Big Bang theory to explain how the universe …

Oct 22, 2024 · Around 13.8 billion years ago, the universe expanded faster than the speed of light for a fraction of a second, a period called cosmic inflation. Scientists aren’t sure what came …

In the first moments after the Big Bang, the universe was extremely hot and dense. As the universe cooled, conditions became just right to give rise to the building blocks of matter – the …

The universe began 13.8 billion years ago, and in its early years, it looked completely different than it does now. For nearly 400,000 years, the entire cosmos was opaque, which means we …

Oct 19, 2023 · Throughout history, countless myths and scientific theories have tried to explain the universe's origins. The most widely accepted explanation is the big bang theory. Learn …