Most simple rockets use a solid fuel engine which, once ignited, burns at a steady rate that cannot be controlled or stopped until the fuel is expended. Hybrid engines on the other hand can be turned ...

Humans have achieved groundbreaking feats in space exploration, reaching distant stretches of space with missions like Voyager 1. However, none of this would have been possible without rockets.

“The conquest of space,” says Rocket Engineer Harold W. Ritchey, “depends on solid propellants.” Dr. Ritchey, chief rocket man for Thiokol Chemical Corp., manufacturer of solid propellants, backs up ...