Editing Explorer 7 (section)

== Satellite description ==
The spin-stabilized satellite's external structure consisted of two truncated conical [[fiberglass]] shells joined by a cylindrical [[Aluminium|aluminum]] center section. The spacecraft was {{cvt|76|cm}} wide at its equator and about {{cvt|76|cm}} high with a payload mass of about {{cvt|41.5|kg}}. The spacecraft was powered by approximately 3000 [[solar cell]]s mounted on both the upper and lower shells. Additional power was provided by 15 rechargeable [[Nickel–cadmium battery|nickel-cadmium batteries]] that were positioned on its equator near the outer skin as an aid in maintaining a proper spin rate. Two crossed dipole (1 W, 20-MHz) telemetry antennas projected outward from the center section, and a 108-MHz antenna used for tracking was mounted on the bottom of the lower shell.

Located around the periphery of the center section were five [[bolometer]]s for thermal radiation measurements and three [[cadmium sulfide]] micrometeoroid detector cells. A cylindrical ion chamber (lithium fluoride window) and a beryllium window X-ray chamber were located on opposite sides of the upper cone, and a cosmic-ray [[Geiger counter]] was located on the very top. A primary cosmic-ray ionization chamber was located within the center portion of the upper cone. Communications and tracking were provided by a 108-MHz transmitter at 15-mW designed to operate for 2 months and a 20-MHz transmitter at 600-mW powered by the solar cells designed for cut-off after about one year.<ref name="Display"/>