James Hansen describes the work on Project Echo's air density experiment known as the "Sub-Satellite." Before launch engineers subjected the sub-satellite to many tests. Here, the sub-satellite is shown prior to tests "to determine the capacity of the 30-inch "Sub-Satellite" to withstand the high temperature of direct sunlight in space, Langley researchers subjected it to 450L F heat test. Results indicated that the aluminum-covered Mylar plastic would effectively reflect the dangerous heat.
