How many missions have been successful on Mars?

It is often said that almost half of the missions to Mars have failed. But it is difficult to give an accurate account of exactly how many campaigns have been successful and how many have failed. But why?

Scientists may be able to easily calculate the number of expeditions, they will also give a percentage, but the real complication in the scientific community is the criteria by which success and failure will be calculated.

For example, the British spacecraft Beagle-2 was able to successfully enter the Martian meteorite in December 2003. The spacecraft also successfully landed on the surface of Mars. But as it was known a few years ago, the spacecraft failed to deliver the news of its successful arrival home. So this campaign failed or succeeds?

Pictures sent by NASA's Mars Reconnaissance Orbiter observation spacecraft show that parts of the Beagle-2 spacecraft, such as the "petals" that were supposed to open during landing, failed to open. Solar panels were attached to the petal-like parts. When they do not open, the communication antennas are closed and the spacecraft's communication path with the earth is closed.

In the context of the Beagle 2-spacecraft, the space mission is said to have left only a scratch mark on the surface of Mars - without any success. But can the fact that the vehicle landed unscathed be considered at least a partial success? There are differences among scientists. Or the Russian Mars-Three spacecraft. The spacecraft first successfully landed on Mars on December 2, 1981. This is the first landing of a spacecraft on Mars. Immediately after landing, the Soviet spacecraft began sending images from there to Earth. The controllers of the mission were overjoyed at this success.

But in less than two minutes on the surface of Mars, the spacecraft's mechanics failed. At that time there was a terrible dust storm. It is believed that the dust storm was the reason why the spacecraft's machinery became useless. Some scientists believe that the dust storm disrupted the spacecraft's electrical system and disrupted the spacecraft's communication with Earth. After the Soviet Union sent spacecraft to Mars five more times, their missions saw real success.