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published by the National Aeronautics and Space Administration
This learning module for Grades 5-8 contains four lessons that explore the scale, relative sizes, and composition of the planets in our solar system. Each lesson provides opportunity for students to build physical models and investigate within a context that is easily understood. Lesson 1 models the orbital distances between the planets; Lesson 2 compares the relative sizes of the planets to those of fruits and vegetables; Lesson 3 models planetary interiors/cores; and Lesson 4 examines characteristics of planet surfaces that make them able to support or not support life.  

This resource is part of NASA's Solar System Exploration website.
Editor's Note: Caveat: when this resource was created, Pluto was still considered a planet. Though an update would be nice, it doesn't detract from the overall excellence of the lessons, which will appeal to kinesthetic learners.
Subjects Levels Resource Types
- Solar System
Education Practices
- Active Learning
= Modeling
General Physics
- Measurement/Units
Other Sciences
- Geoscience
- Middle School
- Elementary School
- Informal Education
- Instructional Material
= Activity
= Instructor Guide/Manual
= Lesson/Lesson Plan
= Student Guide
- Assessment Material
- Reference Material
= Nonfiction Reference
Appropriate Courses Categories Ratings
- Physical Science
- Lesson Plan
- Activity
- New teachers
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General Public
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Does not have a copyright, license, or other use restriction.
Gas Giants, Kepler Mission, atmosphere, orbits, planet composition, planet modeling, planetary cores, planetary orbits, planetary surfaces, planets, relative weight, scale, solar system
Record Cloner:
Metadata instance created October 29, 2012 by Caroline Hall
Record Updated:
August 16, 2020 by Lyle Barbato

AAAS Benchmark Alignments (2008 Version)

4. The Physical Setting

4A. The Universe
  • 3-5: 4A/E4. The earth is one of several planets that orbit the sun, and the moon orbits around the earth.
  • 6-8: 4A/M3. Nine planets of very different size, composition, and surface features move around the sun in nearly circular orbits. Some planets have a variety of moons and even flat rings of rock and ice particles orbiting around them. Some of these planets and moons show evidence of geologic activity. The earth is orbited by one moon, many artificial satellites, and debris.
4B. The Earth
  • 6-8: 4B/M2ab. The earth is mostly rock. Three-fourths of the earth's surface is covered by a relatively thin layer of water (some of it frozen), and the entire planet is surrounded by a relatively thin layer of air.
  • 6-8: 4B/M2cd. Earth is the only body in the solar system that appears able to support life. The other planets have compositions and conditions very different from the earth's.
4F. Motion
  • 6-8: 4F/M3b. If a force acts towards a single center, the object's path may curve into an orbit around the center.
4G. Forces of Nature
  • 6-8: 4G/M2. The sun's gravitational pull holds the earth and other planets in their orbits, just as the planets' gravitational pull keeps their moons in orbit around them.

11. Common Themes

11B. Models
  • 3-5: 11B/E4. Models are very useful for communicating ideas about objects, events, and processes. When using a model to communicate about something, it is important to keep in mind how it is different from the thing being modeled.
  • 6-8: 11B/M1. Models are often used to think about processes that happen too slowly, too quickly, or on too small a scale to observe directly. They are also used for processes that are too vast, too complex, or too dangerous to study.
11D. Scale
  • 6-8: 11D/M3. Natural phenomena often involve sizes, durations, and speeds that are extremely small or extremely large. These phenomena may be difficult to appreciate because they involve magnitudes far outside human experience.

12. Habits of Mind

12B. Computation and Estimation
  • 3-5: 12B/E3. Judge whether measurements and computations of quantities such as length, weight, or time are reasonable by comparing them to familiar values.
  • 6-8: 12B/M5. Estimate distances and travel times from maps and the actual size of objects from scale drawings.

Common Core State Standards for Mathematics Alignments

Standards for Mathematical Practice (K-12)

MP.4 Model with mathematics.

Ratios and Proportional Relationships (6-7)

Understand ratio concepts and use ratio reasoning to solve problems. (6)
  • 6.RP.3.a Make tables of equivalent ratios relating quantities with whole number measurements, find missing values in the tables, and plot the pairs of values on the coordinate plane. Use tables to compare ratios.
  • 6.RP.3.d Use ratio reasoning to convert measurement units; manipulate and transform units appropriately when multiplying or dividing quantities.

Expressions and Equations (6-8)

Reason about and solve one-variable equations and inequalities. (6)
  • 6.EE.7 Solve real-world and mathematical problems by writing and solving equations of the form x + p = q and px = q for cases in which p, q and x are all nonnegative rational numbers.
Solve real-life and mathematical problems using numerical and algebraic expressions and equations. (7)
  • 7.EE.4.a Solve word problems leading to equations of the form px + q = r and p(x + q) = r, where p, q, and r are specific rational numbers. Solve equations of these forms fluently. Compare an algebraic solution to an arithmetic solution, identifying the sequence of the operations used in each approach.

This resource is part of a Physics Front Topical Unit.

Topic: Astronomy
Unit Title: Astronomy Resources for the K-8 Classroom

Wonderful set of four lessons that explore scale, relative sizes, and composition or the planets in our solar system. Kids will work with physical models to understand size and orbital distance in a fun, memorable way. Can be adapted for 5th graders, yet also includes extension mathematics for Grades 7-8, such as calculating planet density. We recommend teaming these hands-on activities with the PhET Solar System Simulator (see Activities below).

Links to Units:
ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
(National Aeronautics and Space Administration, Washington, 2003), WWW Document, (http://web.archive.org/web/20170829052908/https://solarsystem.nasa.gov/docs/modelingsolarsystem_20070112.pdf).
Modeling the Solar System, (National Aeronautics and Space Administration, Washington, 2003), <http://web.archive.org/web/20170829052908/https://solarsystem.nasa.gov/docs/modelingsolarsystem_20070112.pdf>.
APA Format
Modeling the Solar System. (2003). Retrieved December 6, 2021, from National Aeronautics and Space Administration: http://web.archive.org/web/20170829052908/https://solarsystem.nasa.gov/docs/modelingsolarsystem_20070112.pdf
Chicago Format
National Aeronautics and Space Administration. Modeling the Solar System. Washington: National Aeronautics and Space Administration, 2003. http://web.archive.org/web/20170829052908/https://solarsystem.nasa.gov/docs/modelingsolarsystem_20070112.pdf (accessed 6 December 2021).
MLA Format
Modeling the Solar System. Washington: National Aeronautics and Space Administration, 2003. 6 Dec. 2021 <http://web.archive.org/web/20170829052908/https://solarsystem.nasa.gov/docs/modelingsolarsystem_20070112.pdf>.
BibTeX Export Format
@misc{ Title = {Modeling the Solar System}, Publisher = {National Aeronautics and Space Administration}, Volume = {2021}, Number = {6 December 2021}, Year = {2003} }
Refer Export Format

%T Modeling the Solar System %D 2003 %I National Aeronautics and Space Administration %C Washington %U http://web.archive.org/web/20170829052908/https://solarsystem.nasa.gov/docs/modelingsolarsystem_20070112.pdf %O text/html

EndNote Export Format

%0 Electronic Source %D 2003 %T Modeling the Solar System %I National Aeronautics and Space Administration %V 2021 %N 6 December 2021 %9 text/html %U http://web.archive.org/web/20170829052908/https://solarsystem.nasa.gov/docs/modelingsolarsystem_20070112.pdf

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