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This is an activity that models the operation of a seismograph, a tool used to measure the size of earthquakes.

In this activity, learners confront their perceptions of gravity in the solar system.

In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods.

In this activity, learners model the gravitational fields of planets on a flexible surface.

Millions of organisms can live in and around a body of water.

In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

In this activity, learners shrink the scale of the vast solar system to the size of their neighborhood.

In this activity, learners make an astrolabe, a device used for measuring altitude, including the height of objects in the sky.

This fun and simple hands-on astronomy activity lets learners build a scale model of the universe with little more than adding machine tape.

This is an activity about turbidity, or the amount of sediment suspended in water.

In this activity, learners make their own pinhole viewer in order to measure the size of the sun.

How do scientists measure how clear or murky water in a lake is? How does water clarity (clearness) affect what lives in the lake?

In this activity, learners help create and then navigate an outdoor course of the traditional "planets" (including dwarf planet Pluto), which are represented by small common objects.

In this activity, learners explore how anemometers work to record wind speeds and how the equipment has undergone engineering adaptations over time.

In this activity, learners create a map of a hidden surface using a "sounding stick" -- a technique similar to how underwater maps were once made.

In this activity, learners are challenged to calculate their own weight on various planets using a scale and calculator. Older learners may be challenged to do so without using calculators.

In this activity, learners measure and calculate the amount of cubic feet various containers contain. Next, learners investigate cubic feet per second (cps), by carrying jugs in one second.

In this activity, learners use their hands as tools for indirect measurement.