ScienceLinks: Planet Size Comparison

Science Links: Planet Size Comparison


4.7 The student will investigate and understand the organization of the solar system. Key concepts include
a) the planets in the solar system;
c) the relative sizes of the planets.

4.8 The student will investigate and understand the relationships among Earth, the moon, and the sun. Key concepts include
d) the relative size, position, age, and makeup of Earth, the moon, and the sun.


This is a pretty straight-forward resource. Through drop-downs, students can select any two planets who’s sizes they would like to compare. In between those drop downs, they can click on the word “Compare” to draw up the comparison.

Each planet is displayed visually according to scale so that you can see the size difference between the various planets. Below the images is a display of each planet’s diameter (it defaults to kilometers but you can change it to miles) and the comparison ratio.

The quality of the images is not great and the planets are somewhat pixelated, but the concept of sizes is really what is important and it does a great job of visually representing the disparities.

Why this is a quality resource

I was linked to this resource via The National Science Digital Library, and thought it would be a great way to drive home visual representations of size in the solar system. Though some concepts may be above a 4th grade level in terms of math, the teacher could also tie this into math lessons (displaying ratios, decimals as fractions, etc.).

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