Understanding space expansion | Britannica

The universe's origin, often called the Big Bang, wasn't an explosion but a rapid expansion from an extremely hot, dense state. The earliest moments, particularly the Planck epoch (the first 10⁻⁴³ seconds), are shrouded in mystery. Here, general relativity and quantum mechanics conflict, and without a unified quantum gravity theory, known physics fails to describe this era. Slightly later, cosmic inflation—a brief, exponential expansion of space—smoothed out irregularities and laid the foundatio

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