Origins of the Universe
The Big Bang Theory is the leading explanation for the universe's origin, suggesting it began 13.8 billion years ago from a singularity, rapidly expanding and cooling.
Formation of Solar System
Our solar system formed about 4.6 billion years ago. A giant molecular cloud's collapse triggered the creation of the Sun, planets, and other bodies.
Life Emerges on Earth
Earth's first life forms appeared around 3.5 billion years ago. Microbial mats, the earliest ecosystems, were likely common on the young Earth's surfaces.
Oxygen Revolution
Approximately 2.4 billion years ago, cyanobacteria evolved photosynthesis, leading to the Great Oxygenation Event, transforming the Earth's atmosphere and allowing aerobic life to flourish.
Human Ancestors Emerge
The hominid lineage that would lead to Homo sapiens split from chimpanzees and bonobos roughly 6-7 million years ago, with many species evolving since then.
Out of Africa Theory
Modern humans (Homo sapiens) evolved in Africa about 300,000 years ago and began migrating outwards, eventually populating the entire globe in successive waves.
Genetic Ancestry Surprises
Recent genetic studies reveal that modern humans interbred with Neanderthals and Denisovans. This ancient DNA contributes to our immune system's diversity and adaptation.
What started the universe?
Big Crunch phenomenon
Big Bang singularity
Steady State Theory
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