This curriculum guide, part of a series of science units, provides for differentiation of emphasis of subject areas at different grade levels. It is intended that the unit will be studied in depth by grades 1, 4, and 6. Kindergarten, grades 2 and 3 will study the unit in less detail. "Our Wonderful Sun" is studied in Kindergarten, "Earth in Space" in grade 1, "Men and Machines in Space" in grade 2, "Movements of the Earth and Moon" in grade 3, "Our Great Universe" in grade 4, and "From Atmosphere to Space" in grade 6. The unit for each grade contains (1) understandings to be discovered, (2) activities, and (3) activities to assign for homework or individual research. Each activity is introduced by a "leading question," followed by a list of materials and a description of the procedure to be followed. Children are taught to observe, infer, discuss problems and use reference and autiovisual aid materials. There is an index of science textbooks for reference for the teacher. The appendix contains (1) instructions for the construction and use of a star projector, (2) a guide for locating stars and constellations, (3) planetary data, and (4) dates of solar, annular and lunar eclipses. [Not available in hard copy due to marginal legibility of original document]. (LC)