National Geographic : 1962 May
Advent, the Defense artment's satellite, ascends to its statio space along a widening spiral pat The box-shaped space vehicle pro ises a 3 reliable system of global co unica 4 2 tions for the Nation's "ary forces. - IB z. HOW A SATELLITE UNFOLDS IN SPACE 1. Fiberglas shroud shields Advent from air friction 3. No friction tugs as solar paddles extend 5. Explosive bolts free satellite; the 9-foot paddles, holding 38,400 silicon cells, convert solar energy into electricity 2. In space, the shroud parts, exposing satellite 4. Paddles unfolding, Advent coasts in orbit Satellite Satellite Three Advents Can Relay Signals to Any Point but the Polar Areas As if locked to the earth's turning, Advent will orbit once each 24 hours, its speed exactly matching the planet's rotation. Sun-powered flywheels turn the satellite so that its message-gath ering antennas, like the moon's famil iar face, constantly look to the globe. PAINTINGS BY PIERRE MION N.G .S.