[PDF] 2 factors that affect the brightness of a star

The apparent brightness of a star depends on both its luminosity and its distance from Earth.
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  • What are the 3 factors that affect the star's brightness?

    The brightness of a star is determined by its temperature, its size, and its distance from us. Of course, hotter, larger, and closer all imply “brighter” as seen from Earth.6 sept. 2019

  • What factors affect star brightness and Colour?

    The surface temperature of a star determines the color of light it emits. Blue stars are hotter than yellow stars, which are hotter than red stars.

  • What is the most important factor in the brightness of a star?

    Perhaps the most important characteristic of a star is its luminosity—the total amount of energy at all wavelengths that it emits per second. Earlier, we saw that the Sun puts out a tremendous amount of energy every second. (And there are stars far more luminous than the Sun out there.)
  • Stars have a wide range of apparent brightness measured here on Earth. The variation in their brightness is caused by both variations in their luminosity and variations in their distance. An intrinsically faint, nearby star can appear to be just as bright to us on Earth as an intrinsically luminous, distant star.
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Part 2 - Brightness of the Stars

Assessment is limited to relative distances not sizes



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Answer the questions using the above HR Diagram. 1. What factor affects the color of a star? Temp. 2. What factor affects the luminosity of a star?



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Unit 5: Interactions within the Earth Sun and Moon System

This unit is based on 5-PS2-1 5-ESS1-1