Which statement best describes stars?

What characteristic of stars is measured by luminosity?

Which of the following pairs of terms directly relates to the actual brightness of a star?

Two stars have the same apparent magnitude as seen from Earth’s surface. Star A is 33 ly away. Star B is 346 ly away. Which of the following statements is true?

Scientists use the light-year to describe the relationships between objects in space. What does a light-year measure?

Distances between objects in space can be enormous. Which of the following distances is the longest?

A light-year (ly) is the distance that light travels in one year. If a star is 3 ly from Earth, how long does it take light from that star to reach Earth?

Scientists use different units for different types of measurements. A light year is the unit that astronomers use to measure the distance between which objects?

There are billions of stars in the known universe. None of them seem to be as bright as the Sun. Which statement gives the best reason why the Sun appears to be the brightest star.

Astronomers have two ways of measuring the brightness of a star, apparent magnitude and absolute brightness, Which statement best explains the difference between apparent magnitude and absolute brightness?

Which object in our universe has the highest apparent magnitude?

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