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The speed of light is the ultimate speed limit in the univer…

The speed of light is the ultimate speed limit in the universe. 

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The phase of the Moon when it is completely illuminated is c…

The phase of the Moon when it is completely illuminated is called:

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The North Star (Polaris) is useful because:

The North Star (Polaris) is useful because:

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Dark matter has been directly observed with telescopes. 

Dark matter has been directly observed with telescopes. 

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The time it takes Earth to orbit the Sun once is called a

The time it takes Earth to orbit the Sun once is called a

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The Andromeda Galaxy is moving toward the Milky Way. 

The Andromeda Galaxy is moving toward the Milky Way. 

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Mars has liquid water lakes on its surface today. 

Mars has liquid water lakes on its surface today. 

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Stars spend most of their lives in the main sequence phase. 

Stars spend most of their lives in the main sequence phase. 

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Radio waves travel faster than visible light. 

Radio waves travel faster than visible light. 

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One day on Earth is defined by:

One day on Earth is defined by:

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