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40 Cards in this Set
- Front
- Back
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Gravity holds together a large collection of stars, gas, and dust
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galaxy
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Earth's Galaxy
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Milky Way
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What type of galaxy is the milky way
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spiral galaxy
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most common galaxy
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elliptical
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large 3d ecclipses
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elliptcal
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smaller, less common galaxies w/ various difference shapes
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irregular
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how many stars does the milky way contain
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1 trillion
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how many light years are there in the milky way
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100000
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sun orbits galaxy's core every
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225 million years
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universe has always existed just as now
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steady state theory
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universe expands and contracts overtime repeatedly
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oscillating model
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the universe began 13.7 billion years a go w/ a huge explosion that caused expansion everywhere at the same time
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big bang
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when wil the universe stop expanding and start contracting
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unknown
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patterns of stars
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constellations
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constellations are named by
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ancient cultures uses myths or everyday items
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modern astronomy studies how many constellations
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88
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why aren't some constellations visible all year
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orbit
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what constellations are visible all year
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circumpolar
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measure amount of light the star actually gives off
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absolute magnitude
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measure of the amount of a star's light recieved on earth
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apparent
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shift in position when viewed from two different angles
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parallax
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the distance light travels
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light years
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hotest stars
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blue to white
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coolest
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red to orange
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yellow
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medium
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the sun is what color
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yellow
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hr diagrams measure
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brightness and temperature
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who graphed based on temp and absolute magnitude
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henry russell and ejanar hertzsprung
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hot, blue, bright stars in hr
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upper left
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cool, red, dim, stars
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lower right
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average yellow stars in hr
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middle
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only how much percent is not in the main sequence
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10%
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fusion of hydrogen in stars cause
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the releasing of huge amounts of energy
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as particles move closer in a nebula temp
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kincrease
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at how much kelvin does fusion begin and enery from a new star begins to radiate
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10 mill
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balance is lost when hydrogen fuel is
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used up
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contracting and heating causes outerlayers to
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expand and cool creating a giant star
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what forms from a giant star
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white dwarf
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last part of a star's life
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blackhole
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a star can be recycled to become part of a
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nebula
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