MS-ESS1-3: How big, and how far: the scale of the solar system
What students must show for performance expectation MS-ESS1-3, 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 work from data to compare how big solar-system objects are, how they are built in layers, what their surfaces show, and how far they are from the Sun.
Data from instruments on Earth, space telescopes and spacecraft.
Recalling facts about the planets and other solar-system bodies.
Our summary, in our own words. Read the official wording.
The three dimensions
Middle schoolAnalyzing and interpreting data
Analyze and interpret data to find similarities and differences.
ESS1.B Earth and the solar system
The solar system is the Sun and the planets, moons and asteroids held in orbit by its gravity.
Scale, proportion and quantity
Models help us study systems far too large to see whole.
Live tools for this standard
3 toolsLesson sequence
Engage to evaluate- Engage10 min
Lay a 10 m tape along the floor with the Sun at one end. Students place planet cards where they think each planet goes. Keep a photo of the guesses.
- Explore25 min
Hand out the real distances in astronomical units (AU). Rebuild the model at 1 m for every 3 AU: Neptune lands at the far end, and the four inner planets all crowd into the first half meter.
- Explain20 min
Deep Space light-time: how long a signal takes to reach each spacecraft. Convert Voyager 1's distance into AU. Then compare surface features on the Moon and Mars globes, like crater counts and the size of Olympus Mons.
- Evaluate15 min
Data question: which ratio is bigger, Jupiter's diameter to Earth's (about 11) or Neptune's distance from the Sun to Earth's (about 30)? What does that tell you about how empty the solar system is?
Common misconceptions
3 to watch forThe planets are evenly spaced.
The inner planets are close together; the outer planets are spread very far apart.
The tape model.
Pictures in books show the solar system to scale.
Almost none can. If Earth were a 1 mm pinhead, the Sun would be an 11 cm ball 12 m away, and Neptune would be about 350 m away.
Pace out the 12 m in the corridor.
Spacecraft reach the outer planets in days.
Voyager 1 launched in 1977 and has been flying for nearly 50 years.
Read its light-time on Deep Space.
Assessment questions
Answers folded awayMS-ESS1-3: How big, and how far: the scale of the solar system · orbitalradar.com/schools/us/standards/ms-ess1-3
- About how many Earths would fit across Jupiter?
- 2
- 11
- 100
- In a model with Neptune 10 m from the Sun, where is Earth?
- About 33 cm from the Sun
- About 3 m
- About 5 m
- Why do scientists use AU and light-time instead of kilometers?
- The Moon has far more visible craters than Earth. Use data to explain why.
- Read Voyager 1's distance on Deep Space. About how many times farther than the Sun is it?
Answer key
- 11.
- About 33 cm from the Sun.
- The numbers in kilometers are too large to compare easily.
- Earth's weather, water and moving plates wear craters away; the Moon has almost no air and little geology to erase them.
- About 170 times (roughly 170 AU in 2026).
Worksheet
US LetterOne page on US Letter, filled in with live numbers when you open it. Teacher notes and answers included.
The same idea in state standards
Texas, Florida, Georgia- Texas: 7.9A
- Florida: SC.8.E.5.1, SC.8.E.5.3, SC.8.E.5.7
- Georgia: S6E1.c, S4E1.d
Related, not equivalent: each state words and groups its standards differently.
More standards pages
Middle schoolAbout 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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Know a better fit for your class, or a topic we have missed? Tell us and we will add it.
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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). MS-ESS1-3: How big, and how far: the scale of the solar system. Retrieved November 6, 2026, from https://orbitalradar.com/schools/us/standards/ms-ess1-3
“MS-ESS1-3: How big, and how far: the scale of the solar system.” Orbital Radar, 6 Nov. 2026, orbitalradar.com/schools/us/standards/ms-ess1-3. Accessed 6 Nov. 2026.
Orbital Radar (2026) MS-ESS1-3: How big, and how far: the scale of the solar system. Available at: https://orbitalradar.com/schools/us/standards/ms-ess1-3 (Accessed: 6 November 2026).
Orbital Radar. “MS-ESS1-3: How big, and how far: the scale of the solar system.” Last modified November 6, 2026. https://orbitalradar.com/schools/us/standards/ms-ess1-3.
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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.