Clean air rules were designed to protect the environment from harmful car emissions, but they had a surprising secondary effect of influencing car designs.

SpaceX conducted a static fire test of a single Starship 26 engine. The test demonstrated "flight-like startup for a Starship deorbit burn," according to SpaceX. Credit: SpaceX | edited by Space.com's ...

The age of the ICE is far from over. These are some exciting internal combustion engines that we'll see in the next few years ...