Great Ball of Fire from TOPS Learning System Created for PHCA By Dick Heckathorn 28 October 2K + 5

1. If you scale down our real earth, moon and sun at 558 million times, they have the same proportions as the models taped to the wall. model is 2.49m diam. ? a. How many times bigger are the real sizes of the earth, moon and sun than these circles? 558,000,000 b.Are the real earth, moon and sun shaped like these models? No as the real models are 3-D, ours are 2-D.

c.Does this model scale the distances between the sun, earth and moon as well as the size? No 2.Hold your hand in front of one eye so it looks bigger than the model sun. a.How did you increase the apparent size of your hand? You brought your hand closer to your eye.

b. Why does the model sun appear larger, and the model earth appear smaller, that the real objects outside? Because we are viewing them at different distances.

3.Cut a strip of adding machine tape 75- cm long. Square off each end. a.Trace around a nickel to make a row of 10 circles along the upper edge, starting at the left end. The circles should just touch, but not overlap. b. Mark a 20 nickel and a 30 nickel length without drawing circles.

c.Lay 10 paper punches across a piece of clear tape sticky side up. Pick them up with a pin so you can place them, just touching, in a straight row. d.Tape these paper punches to the lower edge of the adding machine tape beginning at the left end. Number them one to 10. e.Mark 10-punch lengths, out to 100.

4.Answer each question using your adding machine tape ruler and the scale model on the wall. a.How many model earths (nickels fit in a row across the dieamter of the model sun? About 108 earths b. How many model moons (paper punches fit across the diameter of the model earth? About 3.5

c.Does your answer apply equally well to our real earth, moon and sun? yes