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Bright Because It Is Close is a free printable Grade 5 science worksheet on arguing that the sun's brightness is due to its distance from Earth, aligned to Common Core standard 5-ESS1-1. It prints 8 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 10 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Bright Because It Is Close

5-ESS1-1

NameDate

Circle the best answer.

1.A star is moved twice as far away in a model. What happens to how bright it looks?
  • A.Nothing changes
  • B.It looks brighter
  • C.It looks dimmer
2.A star looks dim. What are the two possible reasons?
  • A.It is going out
  • B.It is far away, or it gives out less light, or both
  • C.It is always small
3.Which measurement would settle whether a dim star is small or distant?
  • A.Its colour only
  • B.How long you look at it
  • C.Its distance from Earth
4.Two torches of equal brightness are set at 2 m and 20 m. What do you see?
  • A.The far one looks brighter
  • B.The nearer one looks much brighter
  • C.They look the same
5.Why is the sun's apparent brightness poor evidence that it is a large star?
  • A.The sun is not a star
  • B.Brightness never relates to size
  • C.Its closeness explains the brightness without any claim about size
6.What does that torch model show about stars?
  • A.Distance changes how bright a light looks
  • B.Stars are torches
  • C.Torches are stars
7.The sun looks far brighter than any other star. What is the best explanation?
  • A.It is the only real star
  • B.It is very much closer to Earth than the other stars
  • C.It is the biggest star there is
8.What is 'apparent brightness'?
  • A.How bright a star looks from Earth
  • B.How much light it really gives out
  • C.Its temperature

LessonPrint · 5-ESS1-1 · Set 10 · free to copy for classroom use

Answer key — Bright Because It Is Close

Set 10. Prints on its own sheet.

  1. 1.It looks dimmer
  2. 2.It is far away, or it gives out less light, or both
  3. 3.Its distance from Earth
  4. 4.The nearer one looks much brighter
  5. 5.Its closeness explains the brightness without any claim about size
  6. 6.Distance changes how bright a light looks
  7. 7.It is very much closer to Earth than the other stars
  8. 8.How bright a star looks from Earth

More practice for 5-ESS1-1

Argue that stars look dimmer than the sun because they are much further away.

Teaching this next? Bright Because It Is Close is the 60-minute plan for it, with the misconceptions to expect.

All Grade 5 worksheets

Last reviewed 2026-09-05. Aligned to 5-ESS1-1 of the Next Generation Science Standards.