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McC 8Astronomy Ch 24

McC 8 Astronomy Ch 24

white dwarf small, hot star consisting of a hot dense core contracting under the force of gravity
absolute magnitutde actual amount of light a star gives off
apparent magnitude amount of a star's light observed on Earth
parallax apparent shift in position of an object when viewed from different places: used to determine distances
constellations groups of stars whose positions in the sky seem to change as Earth moves
main sequence classification of about 90 percent of the stars
nebula earliest stage of a star's formation
giant large, cool expanding star in which helium fuses to form carbon
light-year distance light travels in a year (9.5 trillion km)
supergiant relatively cool star that has expanded to more than 700 times as large as our sun
neutron star star in which only neutrons can exist in its core
black hole object so dense that nothing, including light, can escape it
supernova produced from an explosion that occurs when a star's core collapses
binary star system two stars revolving around one another
galaxy large group of stars, gas, and dust held together by gravity
Big Bang Theory explanation for the beginning of the universe
Why do stars shine? energy produced by fusion
Friedmann Theory universe began with a big bang followed by a big crunch
Steady-State Theory universe is the same and never changes
Oscillating Theory never-ending cycle of bangs and crunches
What determines how long a star lives? the starting mass
Spiral Galaxy dense central region surronded by arms; arms have young, stars, gas and dust; nucleus has older stars less gas and dust
Barred Spiral Galaxy similar to Spiral Galaxy but arms have a pronounced bar portion coming from the nucleus
Elliptical Galaxy round to discus shaped (football); old stars with little or no gas & dust
Irregular Galaxy patchy sprawling collection of young stars with gas & dust
Name & Type of our Galaxy Milky Way & Barred Spiral Galaxy
How are stars classified? size, brightness and temperature
Colors of Stars from hottest to coolest Blue, White, Yellow, Orange, Red
Brightness of a star depends on size and temperature
Created by: MCJH