When did life on Earth begin? Earth is about 4.5 billion years old. Scientists think that by 4.3 billion years ago, Earth may have developed conditions suitable to support life. The oldest known fossils, …

Apr 7, 2025 · While the exact origin of life remains a subject of scientific debate, the most widely accepted theory is that life began through a series of chemical reactions in Earth’s primordial oceans, …

The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day.

Jul 21, 2025 · The question of how life first appeared on Earth has captivated scientific thought for centuries. While a complete chronicle of life’s emergence remains elusive, scientific investigation …

Jun 24, 2025 · Life on Earth is estimated to have originated at least 3.7 billion years ago, potentially even earlier, based on evidence from ancient rocks and isotopic analysis.

Jul 23, 2025 · Origin Of The Life Life began on Earth approximately 3,800 million years ago. The initial life form was blue algae. Chemical reactions played a crucial role in creating molecules capable of …

Jul 14, 2009 · However, the idea that there is an especially intense “ Late Heavy Bombardment ” between about 4 and 3.8 billion years ago, which obliterates any life, no longer seems to be true. …

Life originated about 3.8 billion years ago, arising most likely from organic molecules that formed in the environment of the early Earth. Many theories exist to explain the origin of the first organic molecules …

From the rise of oxygen to the fall of the dinosaurs, and from the first cells to the possibility of de-extinction, this timeline captures the key milestones of life on Earth.

Dec 13, 2025 · Since Earth is about 4.6 billion years old, these finds suggest that the origin of life must have occurred within a few hundred million years of that time. Chemical analyses on organic matter …