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24 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Astronomy is the study of _____. |
stars |
星星 |
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A star’s _____ measures how bright it appears to observers on Earth. |
apparent magnitude |
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A star’s apparent magnitude measures how bright it appears to observers on _____. |
Earth |
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The scale used for brightness of stars is _____. |
logarithmic |
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In the scale for the brightness of stars, 1 unit less is about _____ times brighter. |
2.5 |
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The brightest stars have _____ values on the scale. |
negative |
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What is the apparent magnitude of the Sun? |
-26.74 |
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What is the closest star to Earth? |
The Sun |
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The _____ telescope can see very dim stars and galaxies. |
Hubble |
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Brightness of stars is affected by how much _____ they emit. |
light |
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Brightness of stars is affected by how much light they _____. |
emit |
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Brightness of stars is affected by their _____ from Earth. |
distance |
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An _____ is the average distance from Earth to the Sun. |
astronomical unit (au) |
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What is the symbol for an astronomical unit? |
au |
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What is the symbol for a light year? |
ly |
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What is the symbol for a parsec? |
pc |
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What unit of measurement is 149 597 871 km? |
1 astronomical unit (au) |
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Distances between stars are called _____ distances. |
interstellar |
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A _____ is the distance light travels in one year. |
light year |
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What unit is about 9.4605284 × 10^15 m? |
1 light year |
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A _____ is about 3.26 light years. |
parsec |
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What unit is about 3.26 ly? |
1 parsec |
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The _____ of a star is how bright a star would appear 10 parsecs from Earth. |
absolute magnitude |
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The absolute magnitude of a star is how bright a star would appear _____ parsecs from Earth. |
10 |
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