The Cosmos Unveiled: Big Bang Theory, Galaxies, and the Life Cycle of Stars

The Cosmos Unveiled: Big Bang Theory, Galaxies, and the Life Cycle of Stars
The Universe: Big Bang Theory, Galaxies, and Stellar Evolution - Cosmos : Refers to the universe. - Cosmic Rays : High-energy particles traveling near the speed of light; exposure can cause gene mutations and cancer. - Cosmology : Study of the universe's properties, origin, and evolution. - Astronomy : Study of celestial objects (stars, planets, comets) and phenomena (solar wind, gravitational waves, etc.). The Universe - Definition : All existing matter and space, including physical (subatomic particles to galactic superclusters) and non-physical components (light, gravity, space). - Scale : Contains ~100 billion galaxies, each with ~100 billion stars (e.g., Milky Way has 100-400 billion stars). Big Bang Theory (BBT) - Origin : 13.8 billion years ago, the universe began as a singularity—a point of infinite density and temperature. - Expansion : The universe has been expanding ever since, cooling and forming matter and energy. - Key Stages :   1. Singularity : Initial high-density, high-temperature sta…