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India is going to launch a spacecraft to the moon on 16 July which will consist of a lander, an orbiter and a rover. I found an article in today's newspaper regarding this. If you zoom in a bit, you will be able to see the list of other lunar missions that have taken place over the years. A common difference that I found in lunar missions of 20th century and lunar missions of 21st century was the time. Earlier, the spacecrafts reached moon in a day or two but recent missions take over 2 months.

With developed technology, it should take even less time, but it's the other way round. Can anyone explain the reason behind this.

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    $\begingroup$ Welcome! This is more of a Space Exploration question than an Astronomy one. $\endgroup$ – Glorfindel Jul 3 '19 at 5:56
  • $\begingroup$ Times of India article online $\endgroup$ – Mike G Jul 3 '19 at 5:57
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    $\begingroup$ I'm voting to close this question as off-topic because it is not about Astronomy as defined in the help center. I would recommend that you ask in Space Exploration SE except that you have already posted the question there as well and hopefully it will be re-opened soon. For future reference, cross-posting the same question in multiple SE sites is strongly discouraged. $\endgroup$ – uhoh Jul 4 '19 at 7:43
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    $\begingroup$ @uhoh I initially posted the question here as I didn't know that there was a stack exchange site specifically for space exploration. Thanks for your help though. $\endgroup$ – Aditya Jain Jul 4 '19 at 7:46
  • $\begingroup$ Sure, Stack Exchange runs a bit differently than most other Q&A sites, it takes a while to get used to its idiosyncrasies. $\endgroup$ – uhoh Jul 4 '19 at 8:00

Some trajectories need less energy than others, so to save on fuel, scientists often choose the lengthy, fuel efficient journey rather than a shorter one. In the case of the Apollo astronauts, it was important to get them to the moon in the shortest possible time, so a short trajectory was chosen.

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