Why was Chandrayaan-2 rotated in the Earth's orbit for a long time, and not launched directly into the Moon's orbit?

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Every spacecraft sent from Earth is first rotated into Earth's orbit. How often to do this depends on the criteria of the mission.

Because there was no passenger in Chandrayaan and there was no risk of loss of life, there was no time-bound. Therefore, there was more emphasis on saving extra expenditure on the mission.

Much like Apollo, it took a huge amount of fuel to reach the moon directly, increasing the weight of the rocket and sending fewer instruments to the lunar space, which would have affected mission targets.

Also, a rocket with such capability that can reach the moon directly today is not with any country.

This is the path of Chandrayaan 2 -

Chandrayaan was initially put into orbit on Earth, as with every spacecraft. When Chandrayaan reached the nearest point from Earth, the rocket was lightly set off, allowing a slight increase in the speed of the vehicle. Chandrayaan's class got a little higher due to its effect. This process was repeated when the Chandrayaan reached the nearest point in the next orbit, making the orbit higher. In this way, the same process was repeated in every orbit and in each step the vehicle got closer to the moon.

In doing so, there has come a time when the impact of the moon's gravity on the plane has exceeded the gravitational effect of the Earth and the moon began to revolve around the moon. Now reverse this process, reducing the speed of the orbit in each orbit, Chandrayaan was gradually sent to the orbit around the moon.

This process is called Gravitational Assist, that is, to take advantage of the motion produced by gravity and send the vehicle ahead of the Earth's orbit.

Never let your car start, you either push it at a speed that starts the engine, or allow the car to slide down a slope to a speed that will start the engine. Just understand that here gravity was also pushing Chandrayan.

In this process fuel consumption is low, mission cost is also low, but because it has so many stages, time takes longer. But with no risk to one's life, and no time constraint, this is the appropriate way to travel to the moon.

This process also does not require specially built, extremely powerful rockets. Chandrayaan 2 is launched with GSLV Mark 3 rocket, which may be India's most powerful rocket to date, but its capacity is 1/10 of Saturn 5.

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