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As we see in the news, it is a serious news that a country starts missile trials in a deserted area and is a political concern. So why? What are these ballistic missiles creating?
ballistic missiles are trouble, especially long-range ones
because:
Ballistic missile is actually a simple tool. work with the principle of inclined shooting in physics. the first speed is thrown up at an angle close to the vertical or dike, then flies for a while, then slashes, the engine shuts down and completes the rest of the flight with this initial speed, falling to a point by the effect of gravity.

missile (flight), flight or midway (midcourse) and strokes phase (terminal) is called respectively.

missile increases the desired range increases the height increases. The body also grows. The weight also increases etc.

In general, missiles with a range of 1,000 km or more complete flight stages outside the atmosphere, ie in space. At the end of this stage, there was only a small piece of warhead left behind as it entered the atmosphere. this part is called the reentry vehicle (rv).

rv enters the atmosphere almost perpendicularly and at tremendous speed. If you are flying at a speed of 5 - 10 or even more, perhaps it is very difficult to be able to detect, hitting a car maybe leave a slightly smaller object.

Until it comes to rv, it is very difficult to detect and follow that body that is flying in space. space-driven sensors are required, ie satellites with radar and infrared sensors.

it is also very difficult to detect when going out into the atmosphere. How can you determine if a missile has been fired from anywhere on your land a few thousand miles from your territory?

Yes, from anywhere.

technology evolved, to fire a missile with a range of several thousand km, we don't need the huge silos we're familiar with. This type of missile can be mounted on a truck, such as a 12x12 truck carrying heavy load cranes. they can get out of a secret hangar and go anywhere and make the missile ready to shoot.

Russia, North Korea and China, is quite prone to developing and producing such missiles.
it is a matter of being able to detect the missile just before or immediately after the fire. It is a separate problem to calculate its orbit very accurately after firing and to create target information suitable for anti-missile systems. While doing all of these things, it is necessary to update the trajectory information in real time, which has ten hundred thousand million factors that affect the accounts, until the butterfly's wings in the pacific wings.

Let's say that we've tracked and followed, and it's a separate concern.

In particular, long-range ballistic missiles rv usually only carry a single warhead title. There are a few warheads (mirv), hard maneuvers to enter the atmosphere, avoiding missiles, there is a fake warhead (5 rv enters into the atmosphere, but which one really carries explosives).

What's more, if you hit this rv after entering the atmosphere, this time you have a debris and explosive mass on your hands uncontrollably. if the ballistic missile carries a chemical, nuclear, biological or similar warhead, the situation becomes even worse.

if you somehow manage to hit the ballistic missile in space, this time you have thousands of debris (space debris), which are all out of the atmosphere, flying in orbit out of your control, each of which becomes a shrapnel. Those who watch the gravity movie will immediately understand what that means.
therefore, missile defense against ballistic missiles is a very complicated, very expensive and very difficult issue.

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