How do light-years help astronomers to determine the ages of distant objects in space?

What is a constellation?

What is the distance of an object from Earth if the object is 7 AU from the sun? (Assume that both Earth and the object are located in the same direction from the sun.)

How do scientists define an astronomical unit?

How are objects located on the celestial sphere?

What is a constellation?

Approximately how many astronomical units are equivalent to one light-year?

A star is located approximately 500 million light-years from Earth. Can a student determine the star's distance by calculating its parallax angle?

What is necessary to calculate a star's distance from Earth?

An astronomical unit is equivalent to

A light-year is a measure of

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