Many supernovae occur when massive stars run out of fuel, rapidly collapse under their own weight, and then explode because of strong shock waves that propel out of their interiors.

For a propeller-powered aircraft, the gas that is accelerated, or the working fluid, is the surrounding air that passes through the propeller.

In-space electric propulsion can reduce the amount of fuel, or propellant, needed by up to 90% compared to chemical propulsion systems.

Sledge hockey is a variation of ice hockey intended for disabled athletes, who sit on aluminium sledges with attached skate blades. The players each use two spiked fibreglass hockey sticks both to propel themselves forward and to pass the puck or shoot it towards the goal.

After World War II, as jet engines gained popularity, aerodynamicists used jet engines to turn the propellers on some aircraft. This propulsion system is called a turboprop.

Algeria needs to propel its economy.

Economic diversification will propell Algeria into the post-oil era.

You can stop the thrust of a liquid rocket by turning off the flow of propellants.

Jet planes fly much faster than propeller planes.

The encounter ignited a flame that propelled her to reinvent herself.