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16 Cards in this Set
- Front
- Back
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Distance from Earth to Moon |
384,000 km |
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Distance from Sun to Earth |
150,000,000 km |
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How many kilometers is an astronomical unit? |
150 million |
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What is a light-year? |
Distance traveled by light in 1 year |
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How many AUs are in one light-year? |
63,000 au |
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What's the nearest star to the earth? |
The sun |
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How how far is the nearest star to the Sun |
4.2 light years |
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What is the nearest star to the Sun |
Proxima Centauri |
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What is the approximate diameter of the Milky Way galaxy |
75000 light years |
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The Milky Way belongs to a cluster of galaxies called what |
Local group |
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What is the approximate distance from the Milky Way to the nearest large Galaxy |
Several million light-years |
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Clusters of galaxies are grouped into _____ which form _____ and _____ around ______. |
Super clusters, filaments, walls, voids |
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List three requirements for a theory to be effective |
1. must be continually tested 2. Must be testable 3. Should be simple |
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Scientific theories can be proven right /wrong? |
They can be proven wrong but they can never be proven right with 100% certainty |
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Scientific method begins with |
Observation |
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What must be done if observations contradict predictions |
Modify or reject hypothesis |
