Vehicles propelled by rocket engines are commonly called rockets. Rocket vehicles carry their own oxidizer, unlike most combustion engines, so rocket engines can be used in a vacuum to propel spacecraft and ballistic missiles. Compared to other types of jet engines, rocket engines are the lightest and have the highest …

The words geopolitical, strategic, and geostrategic are used to convey the following meanings: geopolitical reflects the combination of geographic and political factors determining the condition of a state or region, and emphasizing the impact of geography on politics; strategic refers to the comprehensive and planned application of measures to achieve …