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Physical sciences
Size and scale
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# NASA eClips™️ Real World: Scaling the Solar System

Focusing on the size of our solar system, these two short videos address both its vastness and the measurement of its distances. Part One defines the limits of the solar system; Part Two introduces the Astronomical Unit (AU) and applies it to... (View More)

# Scale Model of the Solar System

Carl Sagan once claimed that the most important lesson we learn from studying the stars is perspective. To address this concept, this activity offers a scale model of the solar system to be evaluated. There are many versions of solar system scale... (View More)

# AstrOlympics

This series of posters illustrates the universality of physical laws by connecting the concepts of rotation, speed, distance, pressure, time, mass, density and acceleration to both Olympic competitions and cosmic phenomena. Each poster includes both... (View More)

# The Size of the Sun

Explore the size relationship between the sun and Earth by using tape and stickers. Learners estimate, then place and count the number of one-inch diameter stickers (representing Earths) that would fit across the diameter of a nine-foot circle of... (View More)

# Chandra Micro/Macro Poster

Comparing and contrasting images at two different scientific scales- the microscopic and the macroscopic- show remarkable similarities in patterns and textures. While the 8-dual images on this poster look very similar, the descriptions and actual... (View More)

Audience: Informal education
Materials Cost: Free

# Playdough Planets

Learners create scale models of Earth, the moon, and Mars out of playdough. Based on the size of the models, they must determine the relative distance between them and then display them at that scale. This activity was designed for use in a library... (View More)

# Where are the Small Worlds?

Using an online interactive platform, learners will explore our solar system from the perspective of the Sun. They will observe the motion of different worlds to determine their location in the solar system. Then they will launch probes to search... (View More)

Audience: Middle school, Informal education
Materials Cost: Free

# How Big, How Far, How Hot, How Old?

This is an activity about scale. Participants will arrange imagery of Earth and many other space objects in order of their size from smallest to largest, their distance from Earth's surface, their temperature from coolest to hottest, and/or their... (View More)

# Earth's Bright Neighbor

Learners select from a variety of fruits to construct a scale model of the Moon, Earth, and Sun. After determining the correct sizes and distances for their models, they remove the Moon. They consider what it would be like if the nearby Moon were no... (View More)

# Dunking the Planets

This is a demonstration about the density of the planets. Learners will compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods. They will then dunk the "planets" in water to highlight the fact... (View More)

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