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.

Rocket technology predates space exploration by almost a thousand years, and although today's computerized multi-ton launch vehicles are a lot more capable than 11th-century gunpowder-assisted arrows, ...

There have been full scale nuclear thermal rocket engines built and tested on the ground since the 1960s. The US had the NERVA project. The attraction is that the ISP would be up to triple the ISP of ...