Understanding these theories is crucial for students as they provide insights into the universe's origin, structure, and evolution, forming the foundation of modern cosmology
Big Bang Theory
- The universe began from an extremely hot and dense state approximately 13.8 billion years ago
- The universe has been expanding and cooling ever since the initial expansion
Oscillating Theory
- The universe undergoes cycles of expansion and contraction
- Each cycle begins with a Big Bang and ends with a Big Crunch (the point of maximum contraction)
- The universe then rebounds and begins expanding again, starting a new cycle
Steady State Theory
- The universe has no beginning or end
- The universe is constantly expanding, but a new matter is continuously created to maintain a constant average density over time
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