The answer is in the build of the Chandrayaan-2 and the fuel capacity it holds.
In case you missed it, Apollo-11 was the first and fastest trip to the lunar surface.
- Apollo-11 took only four days, 6 hours and 45 minutes to get to the lunar surface. Why is Chandrayaan-2 taking so long?
- Apollo-11 was carried by Saturn V which has a lifting power of 43 tonnes. Out of the $185 million that NASA poured into the mission, it spent $110 on Saturn V (Value today – $690 Million).
- While that rocket had the advantage of taking the straight path to the moon, India doesn’t have the same tech.
- GSLV-MkIII only has a 4 Tonne lift capability and the Chandrayaan-2 weighs 3.8 Tonnes.
- The craft headed for the moon has put the modules in Earth orbit. The propulsion system will further help in maintaining the 11km/s velocity.
- “We are using Moon’s gravitational pull to take the craft to the lunar orbit. Though we are taking 29 days to reach the lunar orbit, this is the most cost-effective way to travel to Moon.”
- The basic fact is that Chandrayaan-2 is taking the longer route to the moon because it is using a smaller rocket to lift itself. India poured less money in developing the craft, hence we are taking longer to reach the moon.