Learners discuss why day and night occur after visualizing a teacher-led demonstration.

Students compare two objects at different distances. They explore the concept that distance affects how we perceive the size of objects.

High schoolers examine the observation of "coronal holes," by x-rays, also about related fast streams and moderate magnetic storms that recur at 27 day intervals. They study NASA'S great observatories.

Students create graphic organizer webs that illustrate their thinking about seasonal physical and biological changes caused by changes in sunlight. They identify the central role of sunlight in living systems.

Students discover that sunspots are the result of intense magnetic forces on the photosphere of the sun by observing images from the SOHO satellite.

Students use a graph of daily solar radiation to determine the times of sunrise and sunset. They also compare how sunrise, sunset, and the length of the day changes with latitude and longitude.