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Why Do Eclipses Happen?
Source Institutions
This fun and simple hands-on astronomy activity lets learners create 3D models of the Earth, Moon and Sun to demonstrate solar and lunar eclipses.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-748.jpg?itok=uHytj0R_)
Exploring the Universe: Pack a Space Telescope
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Space telescopes can offer us better, clearer views of the universe (and of our own planet) than Earth-based telescopes can, but getting these large, delicate pieces of equipment into orbit is tricky.
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Water Underground
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Many people get water from a source deep underground, called groundwater.
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Expanding Balloon Universe
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In this activity, learners will discover how our universe is continuously expanding.
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Make a Lake
Source Institutions
Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?