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UPSC Geography 03 - Universe Galaxy & Sun
Universe Galaxy & Sun
- Earth
- Sun
- Billions of Sun- Galaxy (Milky way)
- Billions of Galaxy- Universe
- Billions of Universe- Multiverse
Big Bang Theory
- 13.8 Billion year ago
- Universe is expanding
- Entropy is Increasing
- Background Microwave Radiation-Limit of Observable Universe
Galaxy
- Milky way
- 1,20,000 * 10,000 LY dimension
- Speed of light = 1L 86K Miles per sec
Constellations
- 88 Total
- Hydra (Largest Visible)
- Ursa - Bear
- Orion - Hunter
- Centaurus - Largest
Stars
- Birth from Nebula
- Undergoes Fusion
- When ran out of fuel, they contracts then expands & ultimately explodes called Supernova Explosion
- Became White Dwarf or Black Dwarf <1.4 Solar mass (Chandrasekhar limit)
- >1.4 Neutron Star or Black Hole
- Neutron Star ultimately became Pulser
Hertzsprung Russell Diagram
- The Hertzsprung-Russell Diagram is a graphical tool that astronomers use to classify stars according to their luminosity
Sun
- 30 KLY from the disc (halo)
- G2 Star-classified so, as it has temperature 5,200–6,000 K & color yellowish white
- Population 1 star means contains Heavier elements & is younger
- Core
- Photosphere
- Chromosphere
- corona
** Above Video is created by KapsOne Studies and Placement Center, Nagpur for Guidance of UPSC Civil Service (IAS /IPS / IFS / IRS / SSC / Railways / NDA), MPSC Rajyaseva, UPPSC, MPPSC, BPSC, RPSC aspirants on UPSC Geography 03 - Universe Galaxy & Sun.
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