India has been creating history in its space exploration, and for the first time in the history of Isro, India will launch two rockets to complete a single mission — the country’s fourth moon mission Chandrayaan-4 that will bring moon rocks and soil (regolith) back to Earth.

Two separate rockets — heavy-lifter LVM-3 and Isro’s workhorse PSLV — will carry different payloads for the same moon mission and will be launched on different days.

If successful, Chandrayaan-4, which is slated to be launched not before 2028, will make India the fourth nation with capability to bring back samples from the lunar surface. “The aim of the mission is to collect samples from the lunar surface and return the samples safely to Earth for scientific studies,” according to a recent presentation by Isro chairman S Somanath at National Space Science Symposium.

Unlike previous Moon missions, which involved 2-3 modules, the Chandrayaan-4 mission will consist of a total of five spacecraft modules. These are the propulsion module, descender module, ascender module, transfer module and re-entry module, the presentation said as reported by TOI.

While the four-tonne payload lifter LVM-3 will carry three modules —propulsion, descender and ascender modules, PSLV will launch the transfer and re-entry modules. The two rockets will be launched at different interval of time - one set of modules is likely to take the longer Earth-orbit manoeuvre route and use moon's gravity to travel to the lunar orbit in around 40 days to lessen fuel expense, the other set of modules is likely to travel straight to the lunar orbit like Russia's Luna-25 did by burning fuel. However, the exact sequence of these launches and finer details have not been disclosed by Isro.

To know more about the mission https://timesofindia.indiatimes.com/india/in-a-first-isro-to-launch-2-vehicles-for-chandrayaan-4-mission-spacecraft-to-bring-lunar-rocks-to-india/amp_articleshow/108338698.cms