July 22, 2026. Today marks seven years since a momentous occasion in India's space history. On July 22, 2019, the Indian Space Research Organisation (ISRO) successfully launched 'Chandrayaan-2', its ambitious second lunar mission. This day was not just a milestone for India but heralded a new chapter in science and human ambition for the entire world. India had dared to dream of landing on the Moon's South Pole, an unexplored frontier, aiming to set a new record in space exploration. While the 'Vikram' lander did not achieve its intended soft landing, Chandrayaan-2 provided numerous critical lessons and charted a new course for India's space program.
In this special 'Paripath' blog, we will take a deep dive into the entire journey of Chandrayaan-2. We will explore its scientific objectives, the cutting-edge technology developed by ISRO, the challenges it faced, and the invaluable lessons we learned from this inspiring mission. So, let's embark on India's thrilling journey to the Moon!
The Mission's Core Objectives: New Frontiers in Science
Chandrayaan-2 was more than just a race to the Moon; it was a comprehensive mission driven by a host of ambitious scientific goals. Some of its primary objectives included:
- Studying the Lunar South Pole: The Moon's South Pole is a mysterious and largely unexplored region, believed to harbor significant reserves of water ice. A key objective of Chandrayaan-2 was to conduct an in-depth study of this region, analyzing its soil and rock samples.
- Searching for Water and Minerals: Using specialized instruments on the orbiter, the mission aimed to detect water molecules and various minerals on the lunar surface. This information is crucial for future lunar missions and potential human settlements.
- Investigating Lunar Surface Composition and Seismicity: The mission sought to study the Moon's internal structure and seismic activity using a seismometer on the lander, providing insights into lunar geological processes.
- Analyzing the Lunar Exosphere: Studying the Moon's extremely thin outer atmosphere (exosphere) and analyzing the particles of gas present there was another important objective.
- Achieving a Safe and Controlled Lunar Landing: The most significant technical challenge was to perform a soft and controlled landing of the Vikram lander on the lunar surface, followed by the deployment of the Pragyan rover for scientific experiments.
To achieve these objectives, ISRO developed a suite of state-of-the-art instruments and technologies, which we will explore in detail below.
ISRO's Technological Marvels: A Testament to Indian Engineering
The Chandrayaan-2 mission comprised three main components: an Orbiter, a Vikram Lander, and a Pragyan Rover. Together, these elements were designed to conduct a comprehensive study of the Moon.
1. The Orbiter
The Orbiter proved to be the most successful and crucial part of the Chandrayaan-2 mission. It continues to orbit the Moon, sending back invaluable scientific data to Earth. Its primary function was to circle the Moon at an altitude of 100 kilometers and study it using remote sensing instruments. The Orbiter was equipped with eight advanced scientific payloads:
- Terrain Mapping Camera-2 (TMC-2): For generating high-resolution maps of the Moon.
- Large Area Soft X-ray Spectrometer (CLASS): To study the elemental composition of the lunar surface.
- Solar X-ray Monitor (XSM): To monitor X-ray emissions from the Sun.
- Dual Frequency Synthetic Aperture Radar (DFSAR): For studying the sub-surface structure of the Moon and detecting water ice.
- Imaging Infrared Spectrometer (IIRS): To map the distribution of water and hydroxyl on the lunar surface.
- Orbiter High-Resolution Camera (OHRC): For capturing extremely clear images of the landing site.
- Chandra's Atmospheric Composition Explorer-2 (ChACE-2): To study the lunar exosphere.
- Dual-Band Radio Science (DBRS): To study the electron density in the ionosphere.
The Orbiter has captured some of the best images of the Moon to date and has provided new evidence of water and minerals on the lunar surface.
2. The Vikram Lander
Named after Dr. Vikram Sarabhai, the father of India's space program, the Vikram lander's main objective was to achieve a safe and soft landing on the lunar surface. Vikram was an advanced robotic lander equipped with the following instruments:
- Radio Anatomy of Moon Bound Hypersensitive Ionosphere and Atmosphere (RAMBHA): To study the plasma density on the lunar surface.
- Chandra's Surface Thermophysical Experiment (ChaSTE): To measure the thermal properties of the lunar surface.
- Instrument for Lunar Seismic Activity (ILSA): To monitor lunar quakes.
- Laser Retroreflector Array (LRA): A passive experiment to precisely measure the distance to the Moon using laser beams from Earth.
The Vikram lander had to navigate an extremely critical and complex 15-minute descent phase to land on the Moon, a period often referred to as the '15 minutes of terror'.
3. The Pragyan Rover
The Sanskrit word 'Pragyan' means 'wisdom'. Pragyan was a small, six-wheeled, solar-powered robotic vehicle. After deploying from the Vikram lander, it was designed to traverse up to 500 meters on the lunar surface and conduct chemical analysis of the soil and rocks. It carried two main instruments:
- Alpha Particle X-ray Spectrometer (APXS): To determine the elemental composition (e.g., magnesium, aluminum, silicon, titanium, iron) of lunar soil and rocks.
- Laser Induced Breakdown Spectroscope (LIBS): To analyze the elemental composition of the lunar surface.
The Pragyan rover's goal was to gather detailed information about the composition of the lunar surface.
4. GSLV Mk III (Bahubali) – The Launch Vehicle
The responsibility of successfully launching Chandrayaan-2 into Earth's orbit fell to India's most powerful rocket, the GSLV Mk III, often nicknamed 'Bahubali' (the mighty one). This three-stage rocket accurately placed Chandrayaan-2 into its intended orbit, ensuring a successful start to the mission.
Challenges and Invaluable Lessons: Inspiration from Adversity
The Chandrayaan-2 mission was technically highly complex and challenging. Specifically, achieving a 'soft landing' on the lunar surface presented a formidable hurdle. With no atmosphere on the Moon, traditional methods like parachutes cannot be used. Therefore, controlling the lander's speed and ensuring a safe descent relies heavily on thruster engines and sophisticated sensors. Even a slight error in this process can lead to severe consequences.
“Science offers us the opportunity to learn from failures. Chandrayaan-2 taught us that every attempt is a step towards success.”
On September 6, 2019, when the Vikram lander was just 2.1 kilometers above the lunar surface, it lost communication with ISRO's ground control. Subsequently, the lander experienced a hard landing on the Moon. This event was deeply disappointing for India and ISRO's scientists. The hopes of billions of Indians were tied to this lander, and the setback in the final moments saddened everyone.
However, from this 'failure,' India and ISRO learned immensely. A thorough analysis was conducted to understand the technical shortcomings and areas requiring improvement. Meanwhile, the Orbiter continued its successful operations and is still transmitting valuable scientific data back to Earth. The Orbiter has generated numerous high-resolution maps of the Moon, found evidence of water and minerals, and provided new information about the lunar exosphere. This data proved crucial for future lunar missions, especially Chandrayaan-3.
This experience made ISRO's scientists even more determined. They learned from their mistakes and implemented all necessary changes for the Chandrayaan-3 mission. This is the true essence of the scientific approach – learning from setbacks and moving forward, never giving up.
Igniting Future Explorations: A Step Towards Chandrayaan-3
The lessons learned from Chandrayaan-2 were instrumental in the success of Chandrayaan-3. The experience gained from Chandrayaan-2 allowed ISRO to make significant improvements in the lander's design and the landing procedure. These enhancements included more robust landing legs, increased fuel reserves (allowing for selection of alternative landing sites), and more accurate sensors.
On August 23, 2023, Chandrayaan-3 made history by successfully achieving a soft landing on the Moon's South Pole. India became the first country in the world to land in the lunar South Polar region and the fourth nation overall to achieve a successful lunar landing. This success was a direct culmination of Chandrayaan-2's journey and the lessons it provided. Chandrayaan-2 paved the way, and India, by following that path, realized its dream of conquering the Moon.
Students, the story of Chandrayaan-2 teaches us that no matter how great the challenges in life, we should never give up. With continuous effort, learning from mistakes, and unwavering determination, success is inevitable. India's lunar mission not only showcased our capabilities in space technology but also emphasized the importance of scientific perseverance and resolve.
Did You Know?
- The total cost of the Chandrayaan-2 mission was approximately ₹978 Crores (about 140 million USD), significantly lower than similar lunar missions by other nations.
- The 15-minute descent phase of the Vikram lander to the lunar surface was often dubbed the '15 minutes of terror' due to its extreme complexity and risk.
- The GSLV Mk III used for Chandrayaan-2 is India's most powerful launch vehicle to date, capable of carrying payloads of up to 4 tons to Geosynchronous Transfer Orbit.
- The 'IIRS' (Imaging Infrared Spectrometer) instrument on the Orbiter definitively detected the presence of hydroxyl (OH) and water molecules (H2O) on the lunar surface.
- Approximately 30% of the scientists and engineers involved in the Chandrayaan-2 mission were women, highlighting the increasing contribution of women in India's scientific field.
Conclusion
The Chandrayaan-2 mission was a pivotal moment in India's scientific and technological advancement. Although the Vikram lander did not achieve its intended soft landing, the mission imparted invaluable lessons to India. The Orbiter successfully carried out its tasks, providing the world with a wealth of new information about the Moon. This experience, in turn, paved the way for the unprecedented success of Chandrayaan-3. Chandrayaan-2 taught us that science is not just about success; it's about effort, learning, and rising again after a fall.
Students, we hope this story inspires you in your own lives. No goal is too big, and no problem is greater than your perseverance. Jai Vigyan, Jai Anusandhan!