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Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| spectrograph | a devise that breaks light into colors and produces an image of the resulting spectrum.
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| apparent brightness | a star's brightness as seen from Earth. it's measured fairly easy using electronic devices.
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| absolute brightness | brightness the star would have if it were at a standard distance from Earth. finding absolute brightness is more complex than finding its apparent brightness astronomers must first find out apparent brightness and distance from Earth to calculate it's ABSOLUTE brightness. can vary tremendously.
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| hertzsprung-russell diagram | shows the relationship between the absolute brightness and surface temperature of the star
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| main sequence | diagonal area on the H-R diagram where 90% of stars, including the sun, are located
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| why is it hard to prove black holes exist? | you can't see them and no one has been in or out of one.
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| black hole | an object with gravity so strong that light can't escape
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| how are starts classified? | color, temperature and size
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| what does the color of a star reveal? | it's temperature
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| what color are the coolest stars? | red 3,200 C
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| what color are medium heat star? | yellow 5,500 C
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| what color are the hottest stars? | blue 20,000 C
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| size of stars | varies. most are size of sun but some are giant or supergiant sized.
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| chemical composition of stars | 73% hydrogen 25% helium 2% other elements
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| brightness of a star | depends on it's size and temperature. hotter stars are brighter than cooler stars looks brighter when closer to Earth
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
gott
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