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Japan, South Korea and Poland [citation needed] are generally considered de facto nuclear states due to their believed ability to wield nuclear weapons within 1 to 3 years. [17] [18] [19] South Africa produced six nuclear weapons in the 1980s, but dismantled them in the early 1990s. South Africa signed the NPT in 1991.
As military forces around the world are constantly changing in size, no definitive list can ever be compiled. All of the 172 countries listed here, especially those with the highest number of total soldiers such as the two Koreas and Vietnam, include a large number of paramilitaries, civilians and policemen in their reserve personnel.
Some sources say that Russian and Chinese military spending are actually far higher than the chart due to captive markets and Purchasing Price Parity in those countries. [3] [4] 40 Countries with the highest military spending worldwide in 2023 [1] SIPRI Military Expenditure Database [5] List by the International Institute for Strategic Studies.
The British Empire (red) and Mongol Empire (blue) were the largest and second-largest empires in history, respectively. The precise extent of the Mongol Empire at its greatest territorial expansion is a matter of debate among scholars. Several empires in human history have been contenders for the largest of all time, depending on definition and ...
Solar particle event. Radio emission. v. t. e. Van Allen radiation belt is a zone of energetic charged particles, most of which originate from the solar wind, that are captured by and held around a planet by that planet's magnetosphere. Earth has two such belts, and sometimes others may be temporarily created.
The precise strength of Earth's gravity varies with location. The agreed upon value for standard gravity is 9.80665 m/s 2 (32.1740 ft/s 2) by definition. [4] This quantity is denoted variously as gn, ge (though this sometimes means the normal gravity at the equator, 9.7803267715 m/s 2 (32.087686258 ft/s 2 )), [5] g0, or simply g (which is also ...
An MGRS grid reference is a point reference system. When the term 'grid square' is used, it can refer to a square with a side length of 10 km (6 mi), 1 km, 100 m (328 ft), 10 m or 1 m, depending on the precision of the coordinates provided. (In some cases, squares adjacent to a Grid Zone Junction (GZJ) are clipped, so polygon is a better ...
Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.