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View Resource Galileo: Sunspots

Galileo used his telescope to gather data about the heavens, and his observations and theories sparked much controversy. This video segment discusses Galileo's observations of sunspots, which challenged the current church doctrine that celestial objects were pristine and unblemished, and even demonstrated that the sun rotated. The segment is three minutes forty-two seconds in length. A background...

View Resource Discover the Solar Cycle/ HESSI Lithograph

This lesson allows students plot the percentage of high energy, x-ray solar flares over several years to discover that the solar cycle of sunspot activity is also a cycle of solar flares.

View Resource Exploring Magnetism in Solar Flares: A Teachers' Magnetism Activity Guide for Grades 8-12

Exploring Magnetism in Solar Flares is part of a series of guides highlighting the importance of magnetism in Earth and space sciences. It contains four activities exploring solar flares while addressing science, math, and literacy standards. The material is appropriate for grades 8-12. Lessons are available for download in PDF format.

View Resource Are Sunspots Really on the Sun?

Students measure sunspot speeds and shapes across the solar disk to determine whether the spots are on the Sun or are planets revolving around it (Galileo's dilemma). Includes links to hands-on demonstration of concepts.

View Resource Galileo's Battle for the Heavens

In this activity students are asked to interpret a graph that represents the sunspot cycle from 1900 to 1990, then they are asked to graph the number of sunspots that occurred from 1995 to 2003 in order to understand the sunspot cycle. This lesson integrates Galileo's studies of the sunspot cycle.

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