Life Cycles of Stars

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By: venktwaran (12 month(s) ago)

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Life Cycles of Stars: 

Life Cycles of Stars

The Hertzsprung-Russell Diagram: 

The Hertzsprung-Russell Diagram

How Stars Form: 

How Stars Form Collapsing gas and dust cloud Protostar - mostly infrared

Main Sequence Stars: 

Main Sequence Stars Brown Dwarf Red Dwarf Normal Star

All Objects Exist Because of a Balance Between Gravity and Some Other Force: 

All Objects Exist Because of a Balance Between Gravity and Some Other Force People, Planets-Interatomic Forces Normal Stars-Radiation White Dwarfs-Electron Repulsion Neutron Stars-Nuclear Forces Black Holes-No Known Force

How Stars Die: 

How Stars Die Main Sequence Stars Brighten With Age The More Massive a Star, the Faster it Uses Fuel Giant Phase White Dwarf Supernova Neutron Star - Pulsar Black Hole

Historical Supernovae: 

Historical Supernovae 1006 - Chinese 1054 - Chinese, European, Anasazi? 1572 - Tycho’s Star 1604 - Kepler’s Star 1987 - Small Magellanic Cloud (170,000 l.y.)

Life (Briefly!) Near a Supernova: 

Life (Briefly!) Near a Supernova Sun’s Energy Output = 77 billion megatons/second Let’s relate that to human scales. What would that be at one kilometer distance? 77 x 1015 tons/(150 x 106km)2 = 3 tons Picture a truckload of explosives a km away giving off a one-second burst of heat and light to rival the Sun

Now Assume the Sun Goes Supernova: 

Now Assume the Sun Goes Supernova Brightens by 100 billion times Our 3 tons of explosive becomes 300,000 megatons Equivalent to entire Earth’s nuclear arsenal going off one km away - every second This energy output would last for days

Planetary Systems: 

Planetary Systems Protoplanetary Disks Accretion of Planets Expulsion and Migration of Planets About 30 extrasolar planets known Our Solar System may be unusual?

Protoplanetary Disks in Orion: 

Protoplanetary Disks in Orion