Chandrayaan-3: Rover and Lander in Sleep Mode, Awaiting Moon’s Wake-Up Call

Chandrayaan 3
The Chandrayaan 3 mission's lander and rover are now in sleep mode. (Image credit: ISRO)

In a remarkable feat of lunar exploration, India’s Chandrayaan-3 mission has achieved its primary objectives, marking a significant milestone in the country’s space program. The mission, which aimed to successfully land on the Moon’s southern region, has concluded its initial phase, leaving the Pragyan rover and the Vikram lander in a temporary slumber. In this blog post, we’ll delve into the achievements of Chandrayaan-3, its current status, and what the future holds for these lunar explorers.

The Triumph of Chandrayaan-3

Chandrayaan-3’s journey began with a daring landing on the Moon’s surface on August 23. It became India’s first successful lunar landing mission and a historic achievement worldwide as the first successful landing in the southern lunar region. The mission’s primary focus was to explore the tantalizing possibility of frozen water deposits hidden within permanently shadowed craters near the Moon’s south pole.

Over the course of a little under two weeks, the Pragyan rover, a vital component of the mission, embarked on its lunar odyssey. It traversed an impressive 330 feet (100 meters) of the lunar surface, conducting a range of scientific experiments, including chemical analysis of the Moon’s surface, temperature profiling of the regolith’s top 4 inches, and measurements of the tenuous plasma enveloping the Moon.

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Preparing for Lunar Night

As the lunar day came to an end, the Chandrayaan-3 team at the Indian Space Research Organization (ISRO) decided to put the Pragyan rover and the Vikram lander into “sleep mode.” This involves deactivating the scientific instruments and conserving power while the vehicles wait for the Moon’s next sunrise, expected on September 22, 2023.

The rover’s battery is fully charged, and its solar panel is optimally oriented to capture the incoming sunlight. Similarly, the Vikram lander will rest alongside Pragyan, falling asleep once its battery is depleted. ISRO scientists are now anxiously anticipating the awakening of these two lunar explorers when the Sun bathes them in light once more.

What happens during the lunar night?

The Moon’s axis is tilted at an angle of about 5 degrees, which means that its poles experience two weeks of sunlight followed by two weeks of darkness. This is known as the lunar night.

During the lunar night, the temperature at the Moon’s poles can drop to as low as -200 degrees Celsius. This is because there is no sunlight to warm the surface. The lack of sunlight also means that solar power is unavailable.

As a result, most spacecraft that visit the Moon must go into sleep mode during the lunar night to conserve energy. This means that they turn off all but their essential systems.

How will the Chandrayaan-3 lander and rover wake up?

The Chandrayaan-3 lander and rover are equipped with batteries that can power them for two weeks. They also have solar panels that can recharge the batteries when the Sun is shining.

When the Sun rises again at the Moon’s south pole on September 22, 2023, the Chandrayaan-3 lander and rover will receive a signal from ISRO to wake up. The solar panels will then begin to recharge the batteries, and the vehicles will come back to life.

What will the Chandrayaan-3 lander and rover do after they wake up?

Once the Chandrayaan-3 lander and rover wake up, they will begin their scientific mission. The lander will deploy a number of instruments to study the Moon’s surface, composition, and atmosphere. The rover will drive around the landing site and collect data on the Moon’s geology and chemistry.

The Chandrayaan-3 mission is expected to last for two months. During that time, the lander and rover will collect a wealth of data that will help scientists to better understand the Moon.

The Significance of Vikram’s Hop

Before entering its sleep mode, the Vikram lander executed a short “hop,” moving about 16 inches (40 centimeters) closer to the Pragyan rover. This maneuver serves as an important test for future sample return missions that may need to launch from the Moon’s surface. It showcases ISRO’s commitment to advancing lunar exploration and its ambitions for more ambitious lunar missions in the future.

The Challenges of Lunar Landing

Chandrayaan-3’s success is a testament to the dedication and expertise of ISRO’s scientists and engineers. Lunar landings are notoriously challenging, as demonstrated by past missions. India’s previous attempt with Chandrayaan-2 in 2019 faced setbacks when its lander crashed due to a software glitch. Only four countries – the U.S., USSR, China, and India – have achieved successful lunar landings to date. Recent mishaps, such as Russia’s Luna-25 and Japan-based company ispace’s Hakuto-R spacecraft, highlight the complexities of lunar exploration.

The Lunar Frontier and the Future

Chandrayaan-3’s achievements open exciting possibilities for future lunar exploration. The NASA-led Artemis 3 mission plans to land the first humans on the Moon’s southern polar region, attracted by the presence of water deposits in permanently shadowed craters. This water could be a valuable resource for sustaining a lunar base, providing drinking water, and producing oxygen, thus reducing the costs of maintaining a lunar outpost.

1. Scientific Exploration: The Moon’s unique environment provides a pristine laboratory for studying the formation and evolution of the solar system, understanding the effects of space radiation, and exploring potential biosignatures. Future missions will focus on collecting lunar samples, conducting deep lunar surface drilling, and establishing lunar observatories.

2. Resource Utilization: The Moon is rich in resources, including water ice, rare earth elements, and helium-3. These resources could be utilized for in-situ resource utilization (ISRU), enabling the production of fuel, water, and construction materials for a lunar base.

3. Technological Advancements: Lunar exploration drives innovation in various fields, including robotics, propulsion systems, radiation shielding, and life support systems. These advancements will not only benefit lunar exploration but also have applications on Earth.

4. Lunar Base Establishment: The Moon serves as an ideal stepping stone for further exploration of the solar system. A permanent lunar base would provide a staging ground for future missions to Mars and beyond, allowing crews to train, conduct experiments, and prepare for longer-duration space travel.

5. International Collaboration: Lunar exploration is fostering international collaboration among space agencies around the world. Partnerships like the Artemis Accords aim to establish a global lunar governance framework, ensuring a peaceful and sustainable exploration of the Moon.


Chandrayaan-3 has secured its place in history as a successful lunar mission, pushing the boundaries of lunar exploration and paving the way for future missions. As Pragyan and Vikram rest in their lunar slumber, we eagerly await their awakening, hoping for further insights into the mysteries of the Moon’s south pole. India’s space program has demonstrated its prowess on the lunar frontier, leaving us with great anticipation for what lies ahead in our cosmic exploration journey.


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