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In this activity, a Whiffle® ball containing a battery-operated buzzer is twirled in a circle to demonstrate the Doppler effect. The demonstration is an illustration of how stellar spectra can be used to measure a star's motion relative to Earth along the line of sight. This activity is part of Unit 2 in the Space Based Astronomy guide that contains background information, worksheets, assessments, extensions, and standards.
This resource is located on page 45 of the PDF document.