5-ESS1-1: Why the Sun looks brighter than other stars
What students must show for performance expectation 5-ESS1-1, with a lesson sequence built on live data, the misconceptions to expect, and assessment questions with answers.
Last updated . Curriculum links last reviewed November 2026.
What students must show
Our summary- Students argue from evidence that the Sun and other stars differ in how bright they look because of how far they are from Earth.
- Students use the idea that stars are at very different distances.
Relative distance as the reason stars look brighter or dimmer.
Star sizes, and other things that change a star's brightness such as its mass, age or stage of life.
Our summary, in our own words. Read the official wording.
The three dimensions
Grade 5Engaging in argument from evidence
Support an argument with evidence, data or a model.
ESS1.A The universe and its stars
The Sun is a star that looks larger and brighter because it is closer; stars are at hugely different distances.
Scale, proportion and quantity
Natural objects range from the very small to the immensely large.
Live tools for this standard
3 toolsLesson sequence
Engage to evaluate- Engage10 min
Ask: is the Sun a star? Many say no. Show the live Sun next to a photo of the night sky. What is the same, and what is different?
- Explore25 min
Two identical flashlights: one 2 m from the class, one 15 m away down a corridor. Which looks brighter? Swap them. Record what changes the brightness and what does not.
- Explain15 min
Light from the Sun is about 8 minutes old when it arrives; light from the next nearest star set off more than 4 years ago. Show Deep Space light-time: even our farthest spacecraft is less than a light-day away. The Sun is the near flashlight.
- Evaluate15 min
Students write an argument: a claim, two pieces of evidence (the flashlight test, light-time) and the reasoning that links them.
Common misconceptions
3 to watch forThe Sun is not a star.
The Sun is an ordinary star. It only looks special because it is so close.
Ask what the Sun would look like from 4 light-years away: a bright point, like the stars at night.
All the stars are the same distance away, stuck on a dome.
Stars are at very different distances, from about 4 light-years to many thousands.
The flashlights placed at different distances along the corridor.
The brightest-looking stars are always the biggest.
A star can look bright just because it is near: distance matters a lot.
A small flashlight up close can outshine a big one far away.
Assessment questions
Answers folded away5-ESS1-1: Why the Sun looks brighter than other stars · orbitalradar.com/schools/us/standards/5-ess1-1
- Why does the Sun look brighter than any other star?
- It is the biggest star
- It is the closest star
- It is the hottest star
- Two identical lamps are 5 m and 50 m away. Which looks dimmer?
- The one 5 m away
- The one 50 m away
- They look the same
- Light from the Sun takes about 8 minutes to reach Earth. Light from the next nearest star takes about 4 years. What does that tell you?
- If you flew far away from the Sun, how would it look?
- Use Deep Space: about how long does light take to reach Voyager 1 today? Is Voyager closer to us than the nearest star?
Answer key
- It is the closest star.
- The one 50 m away.
- The other star is far, far farther away, so it looks much dimmer.
- Smaller and dimmer, until it looked like any other star.
- Nearly a whole day; yes, far closer: the nearest star is more than 4 light-years away.
Worksheet
US LetterNo live-data worksheet for this standard yet: print the assessment questions above. All sheets: the worksheet library.
The same idea in state standards
Texas, Florida, Georgia- Texas: 2.9A
- Florida: SC.3.E.5.3, SC.3.E.5.1
- Georgia: S2E1.b, S4E1.b
Related, not equivalent: each state words and groups its standards differently.
More standards pages
Grade 5About these codes
These are our suggestions for where each tool fits. Always preview a page before using it with a class: some tools show ads, these school pages do not.
Codes are performance expectations of the Next Generation Science Standards*, for example 5-ESS1-2. Each summary is our own wording; follow the link on a standard page for the official text.
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Cite this page
Pick a style, then copy it or download it for your reference manager.Orbital Radar. (2026, November 6). 5-ESS1-1: Why the Sun looks brighter than other stars. Retrieved November 6, 2026, from https://orbitalradar.com/schools/us/standards/5-ess1-1
“5-ESS1-1: Why the Sun looks brighter than other stars.” Orbital Radar, 6 Nov. 2026, orbitalradar.com/schools/us/standards/5-ess1-1. Accessed 6 Nov. 2026.
Orbital Radar (2026) 5-ESS1-1: Why the Sun looks brighter than other stars. Available at: https://orbitalradar.com/schools/us/standards/5-ess1-1 (Accessed: 6 November 2026).
Orbital Radar. “5-ESS1-1: Why the Sun looks brighter than other stars.” Last modified November 6, 2026. https://orbitalradar.com/schools/us/standards/5-ess1-1.
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* Next Generation Science Standards is a registered trademark of WestEd. Neither WestEd nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of this product, and do not endorse it.