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46 Cards in this Set
- Front
- Back
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a star's brightness as if it were a standard distance is its..
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absolute magnitude
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a huge group of stars such as the milky way is an...
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galaxy
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the unit used to measure distances beween starts is a...
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light year
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the region of the H-R diagram with the mos stars it the ....
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main sequence
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a graph of stars showing temperature on the x-axis and brightness onthe y-axis is...
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H-R diagram
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what is used to determine the distance to nearby stars
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parallax
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space and every thing in it
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universe
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the brightness of a star as seen from earth is its...
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apprent magnitude
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becase of its large size the star aldebaran is often called a ...
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giant star
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what are the main characteristics used to classify stars
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size, temerature, and brightness
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how is the sun classified
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realitively hot
medium sized bright |
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emits pulses of radio waves
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pulsar
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what an average-sized star becomes at the end of a stars "life"
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white dwarf
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a huge cloud of gas or dust in space
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nebula
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the earliest stage of a stars life
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protostar
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an explosion that occure at the end of a giant stars life
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supernova
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formed from the leftover material after a giant star explodes with three times the mass of the sun, but a diameter of only about 20 kilomeaters
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neutron star
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exerts such a strong gravitational pull htat no electromagnetic radiation can escape
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black hole
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shines brightly in the center of a distant galazy because of the friction of materical spiraling around it
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quasar
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stars that are members of groups of two or more stars that revolve around eachother
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star system
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star system with two stars
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binary star
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a system in which one star blocks the light from another star
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eclipsing binary
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star system with two stars
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binary star
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which direction are nearly all galaxies moving realative to earth
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away from us
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what is the general relationship between a falaxys distance from earth and its speed
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the farther aways it is the faster its moving away
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what is red shift
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moving away from us
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what is blue shift
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moving towards us
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osolating
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expands and contracts
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steady state
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every thing stays the same
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big bang
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univers began with a huge explousion
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about how old is our univers
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15 million years ago
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how were the astronomers the H-R digram named after
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ejnar Herstprung and enery norris Runssel
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what is the y axis on the H-R digram
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brightness
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what is the xaxis on the H-R digram
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surface temature
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what is the unit of measure for the label on the x axis
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celius
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what are the six colors of stars
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blue
blue white red red orange white yellow |
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what color are the hottest stars
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blue or blue-white
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what color are the coolest stars
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red
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what are the five star groups
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giants
super giants white dwafrs main sequence neutron stars |
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what determines which group a star belongs
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size and temerature
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what is the relationship between size and temperature
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smaller the hotter
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what is the relationship between size and brightness
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bigger the brighter
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which star group contains the dimmest stars
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white dwarfs
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which star group contains the hottest stars
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main sequence
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whice star group contains the collest stars
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giants
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when comparing the "life" of a star what is a ...
protostar fusion ignition to main sequen red giant/super giant white dwarf/black hole |
fetus
infancy through adulthood middle age old age/death |
