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Marano- Astron. Star

Marano -Astronomy- Stars

stars ball of dust and gas (H and He)
star's color depends on temperature
blue-colored star 30,000 degrees
white-colored star 7500 degrees
yellow-colored star 5 to 6,000 degrees
red-colored star 3500 degrees (coolest)
Stars are classified by temperature, brightness
Before telescopes, the brightest star in the sky was called first magnitude
Before telescopes, the dimmest star in the sky was called sixth magnitude
Apparent magnitude how bright a star looks
Absolute magnitude actual temperature
HR diagram shows relationship between a star's temperature and absolute magnitude
blue stars expand into giants or supergiants
main sequence where stars spend most of their lives
white dwarfs small, hot stars that are the leftover centers of old stars, near the end of life
nebula large cloud of gas and dust in space
gravity causes a nebula to condense (squish), get hot and create the core
nuclear fusion when hydrogen joins with hydrogen, helium and hydrogen + a lot of energy
When nuclear fusion begins a star is born
Young stars have a lot of hydrogen
Older stars have less hydrogen and more helium
When most of hydrogen fuel is gone, the outer layer of gas begins to expand, cool and glow red- called Red (super) giant
When a red giant uses up most of its hydrogen and helium, gravity squishes the star, and it gets hotter-called White dwarf
No energy, heat or light just a small, dense, cold lump called Balck Dwarf or Cold Star
supernova a massive star that may explode in a flash of light
Death of a large star by explosion happens when outer layers collapse too quickly
neutron star some exploded particles pull together
pulsar spinning neutron star
black hole after a supernova particles clumped together to size of small point- even light
Created by: seagullq