The long rocket road from India to the Moon

India's quest to reach the Moon has been a journey marked by trial and error, steady growth, and increasingly ambitious goals. Long before a spacecraft made a historic soft landing near the Moon's south pole, India had to develop rockets capable of carrying heavier payloads beyond Earth's atmosphere. This development did not occur overnight but rather unfolded over years as each launch vehicle expanded what India could place into space.

Two key rockets were instrumental in this evolution: the Polar Satellite Launch Vehicle (PSLV) and the Launch Vehicle Mark-3 (LVM3).

PSLV, India's workhorse, made its maiden flight in 1993 and became a cornerstone of India's space program. This medium-lift rocket, featuring four stages with both solid and liquid propulsion, was capable of placing satellites into various Earth orbits. Over time, PSLV's role expanded to include Earth-observation, navigation, and commercial satellites, as well as missions beyond Earth such as Chandrayaan-1 and the Mars Orbiter Mission.

However, PSLV's capabilities had their limits, pushing India to seek a more powerful launch vehicle.

The answer came in the form of the LVM3, initially known as the Geosynchronous Satellite Launch Vehicle Mark III (GSLV Mk III). This rocket was not merely a larger version of PSLV but a completely different configuration combining two large solid boosters with a liquid-fuel core stage and a cryogenic upper stage. Standing 43.5 meters tall and weighing approximately 640 tonnes, the LVM3 was designed to accommodate larger payloads. Its significance became particularly evident with India's lunar program.

Chandrayaan-2, launched towards the Moon in 2019, was the first mission to utilize the LVM3. The success of this mission set the stage for Chandrayaan-3, which lifted off aboard the LVM3 four years later and accomplished a historic soft-landing near the Moon's south pole. This achievement underscored how far India's launch capability had advanced. But it also highlighted the ongoing need for bigger rockets as larger ambitions emerged.

India's progress from PSLV to LVM3 is more than just a tale of rocket size; it represents years of technical advancements in rocket and launch technology, as well as innovative mission design. Each generation of rockets enabled India to attempt missions beyond the previous limit. Looking ahead, India's ambitions extend to heavier satellites, human spaceflight, and future lunar missions.

These goals will require even greater launch capability, illustrating that the journey to the Moon was not just about reaching a destination but about building the infrastructure for future endeavors.