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Sizing Up the Universe
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In this online interactive challenge, learners choose items to represent the Earth or solar system, then determine other items to represent the Moon, or Milky Way based on their relative size.

Eclipse: How can the little Moon hide the giant Sun?
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In this activity, learners explore how distance can affect the way we perceive the size of an object.

Scale Model of Sun and Earth
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In this activity, learners explore the relative size of the Sun and Earth as well as the distance between them.

Scale Models
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In this activity, learners explore the relative sizes and distances of objects in the solar system.

The Thousand-Yard Model
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This is a classic exercise for visualizing the scale of the Solar System.

Modeling the Night Sky
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In this two-part activity, learners explore the Earth and Sun's positions in relation to the constellations of the ecliptic with a small model.

Space Jell-O
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Albert Einstein proved that space bends around anything that has mass. This activity uses Jell-O's ability to bend around objects as a model for space bending around planets and stars.

Spot the Sunspots
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In this activity, learners use binoculars (or a telescope) to identify and track sunspots. If using binoculars, learners need a pair that can be secured on a tripod.

Model the Sun and Earth
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In this activity, learners make scale models of the Sun and Earth out of paper mache.

Transit Tracks
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In this space science activity, learners explore transits and the conditions when a transit may be seen.