Stars Distance Size and Brightness

Why do some stars appear brighter than others in the night sky?

• They are closer to Earth.

• They are larger in size.

• They are older stars.

• They are made of different materials.

Which factor primarily determines the brightness of a star as seen from Earth?

• The star's age

• The star's distance from Earth

• The star's color

• The star's shape

Tags

NGSS.HS-PS4-3

What is the main reason some stars are bigger than others?

• They have more mass.

• They are closer to Earth.

• They are older.

• They are made of different elements.

How does the size of a star affect its brightness?

• Larger stars are always dimmer.

• Larger stars are always brighter.

• Larger stars can be brighter because they emit more light.

• Size does not affect brightness.

Consider two stars of the same size but different distances from Earth. Which one will appear brighter?

• The one that is farther away

• The one that is closer

• They will appear equally bright

• The one that is older

If a star is very bright but not very large, what could be a possible reason?

• It is very close to Earth.

• It is very far from Earth.

• It is a very old star.

• It is a very young star.

Which of the following statements is true about the size of stars?

• All stars are the same size.

• Stars can vary greatly in size.

• Stars are only small.

• Stars are only large.

How might astronomers determine the size of a star?

• By measuring its brightness and distance

• By measuring its color only

• By measuring its temperature only

• By measuring its age

What role does a star's mass play in its size?

• More mass generally means a larger size.

• More mass generally means a smaller size.

• Mass does not affect size.

• Mass only affects brightness, not size.

Why might two stars of the same size have different brightness levels?

• They are made of different materials.

• They are at different distances from Earth.

• They are different colors.

• They are different ages.