50 Fun Facts About Chandrayaan

Chandrayaan-3's landing broadcast drew eight million simultaneous viewers, a record live stream on which platform?

ISRO's own channel set YouTube's live record on landing day, beating the 2022 World Cup peaks of Brazil's CazéTV streams.

From which island spaceport on India's east coast, in Andhra Pradesh, did all three Chandrayaan missions launch?

Sriharikota sits on a barrier island between Pulicat Lake and the Bay of Bengal, picked for its empty safety zone and nearness to the equator, which helps eastward launches.

Chandrayaan-2 and -3 each carried a lander named after which physicist, the founder of India's space programme?

Vikram Sarabhai earned a Cambridge PhD on cosmic rays under C. V. Raman's supervision and also helped set up the Indian Institute of Management in Ahmedabad.

Chandrayaan's six-wheeled rover is called Pragyan, a Sanskrit word meaning what?

Wisdom is what Pragyan means, and the rover cannot talk to mission control directly: everything it learns is relayed through its lander.

Which Russian lander crashed days before Chandrayaan-3 touched down, ending its bid to reach the south pole first?

Luna 25 was Russia's first Moon shot since 1976, and it hit the surface after a braking engine ran for 127 seconds instead of the planned 84.

Chandrayaan-1 deliberately crashed a probe onto the Moon in November 2008 on the birthday of which Indian leader?

Jawaharlal Nehru's birthday is also India's Children's Day, and ISRO named the impact site Jawahar Sthal in his memory.

Chandrayaan-3's rover zapped the soil with its LIBS spectroscope to confirm which element near the south pole?

Sulfur had only been inferred from orbit before, and the same rover readings also picked up aluminium, calcium, iron, chromium, titanium, manganese, silicon and oxygen.

Chandrayaan-2's lander debris was spotted in NASA images by a volunteer, Shanmuga Subramanian, from which Indian city?

Chennai software engineer Shanmuga Subramanian compared NASA orbiter photos pixel by pixel and found the wreckage before NASA's own team confirmed it.

Before Chandrayaan-3, which country had made every successful soft landing on the Moon this century, starting in 2013?

China's Chang'e 3 landed in December 2013, the first soft landing anywhere on the Moon since the Soviet Union's last lander in 1976.

The programme's name Chandrayaan joins the Sanskrit word for the Moon to the word for what?

Vehicle is what yaan means, so the name reads as 'Moon craft', and the project was announced by the prime minister on Independence Day 2003.

Which ISRO rocket, India's heaviest with two giant solid boosters, launched Chandrayaan-2 and Chandrayaan-3?

LVM3 flew as GSLV Mk III until 2022 and can put about ten tonnes into low orbit, roughly 43 metres of rocket weighing 640 tonnes at liftoff.

Chandrayaan-1 rode which ISRO workhorse rocket, in its stretched XL variant, into orbit in October 2008?

PSLV's XL version carried the 1,380 kg orbiter, a rocket far smaller than the heavy-lift launcher ISRO needed for the later lander missions.

During Chandrayaan-2's September 2019 landing attempt, the lander began veering off course at roughly what altitude?

At 2.1 km the lander had just entered its camera-guided navigation phase, and a software glitch left its engines thrusting harder than planned until contact was lost seconds from touchdown.

Which foreign partner was first meant to build Chandrayaan-2's lander, before pulling out of the deal?

Roscosmos could not deliver the lander even by a revised 2015 date, so ISRO built its own, a decision that pushed the launch to 2019.

Chandrayaan-3's landing site was given which name, formally recognised by the International Astronomical Union in 2024?

Statio Shiv Shakti pairs Shiva, a god linked with the Moon, with Shakti, divine feminine energy, and the prime minister announced it three days after the landing.

India's National Space Day, first held in 2024, falls on which date, the anniversary of Chandrayaan-3's touchdown?

23 August became National Space Day by government decree, and the first edition ran under the theme 'Touching Lives while Touching the Moon'.

Which ISRO chairman declared 'India is on the Moon' the moment Chandrayaan-3's lander touched down?

S. Somanath had been project director of the very rocket that launched the mission, and he handed the chairmanship to V. Narayanan in January 2025.

Which ISRO chairman, the son of a mango farmer, led the agency through Chandrayaan-2's launch and lost landing in 2019?

K. Sivan was filmed in tears after the lander fell silent, and the prime minister's hug for him became one of the mission's defining images.

Which engineer, later dubbed the 'Moon Man of India', was project director of Chandrayaan-1 from 2004 to 2008?

Mylswamy Annadurai went on to oversee the Mars Orbiter Mission and received the Padma Shri in 2016, having grown up in a village near Coimbatore.

Chandrayaan-1 fell silent in 2009, well short of its planned two years; how many days had it operated?

312 days was enough for the orbiter to complete over 3,000 orbits and send back some 70,000 images before a power-supply failure cut contact.

After dropping off its lander, Chandrayaan-3's propulsion module was steered in late 2023 into orbit around which body?

Earth orbit was reachable because the module had fuel to spare, and the manoeuvre rehearsed the homeward leg a future round-trip mission will need.

Chandrayaan-3's solar-powered rover weighed roughly how much, light enough for two people to carry?

26 kg of rover ran on just 50 watts of solar power, about the draw of a laptop charger, and rolled down a ramp from the lander hours after touchdown.

Chandrayaan-3's six-wheeled rover was designed to creep across the lunar surface at what speed?

1 cm per second is slower than a garden snail in a hurry, a pace set so the rover could be steered by commands relayed through its lander.

Chandrayaan-3's rover covered roughly how much ground before going to sleep, against a design goal of 500 m?

About 100 m was all the rover managed, 101.4 m to be exact, partly because it had to detour around a crater it met early on.

Chandrayaan-3's lander and rover were built to last one stretch of lunar daylight, which is roughly how many Earth days?

14 days of sunlight powered the solar panels, and after the long freezing night that followed, neither craft answered ISRO's wake-up calls.

Chandrayaan-3's ILSA seismometer recorded ground vibrations three days after landing that ISRO presumed to be what?

A natural moonquake had not been recorded by instruments on the surface since the Apollo seismometers were switched off in 1977.

Days after landing, Chandrayaan-3's lander refired its engines for a short 'hop', lifting itself about how high?

40 cm up and 30 to 40 cm sideways was enough to prove the lander could relaunch, a rehearsal for a future mission that must lift off again from the Moon.

Chandrayaan-2's orbiter was planned to last one year; a fuel-saving launch stretched that to roughly how long?

About 7 years of life let the orbiter outlast its crashed lander and serve as a relay for Chandrayaan-3, while its camera resolves objects 32 cm across.

Chandrayaan-4, approved by India's cabinet in 2024, is designed to be India's first mission to do what on the Moon?

Bring back lunar samples is the goal, up to 3 kg of regolith, using a craft launched in two halves on separate rockets and docked together before heading out.

How many scientific instruments did Chandrayaan-1 carry, six of them built abroad rather than in India?

11 instruments shared a payload of just 90 kg, with five Indian-built and the rest supplied by NASA, ESA and one smaller partner.

Alongside NASA and ESA, which European country's academy of sciences put a radiation monitor on Chandrayaan-1?

Bulgaria's RADOM-7 dosimeter mapped radiation around the Moon, data later used to judge how safely astronauts could work there.

Chandrayaan-1 fell silent in 2009, yet in 2016 NASA found it still circling the Moon using what?

Ground-based radar from NASA's Goldstone antenna, with echoes caught at Green Bank, picked out a 1.5-metre cube 380,000 km away as it crossed the lunar north pole.

Chandrayaan-1's Mini-SAR instrument found dozens of ice-bearing, permanently dark craters near which part of the Moon?

The north pole, not the south, is where Mini-SAR spotted more than 40 shadowed craters thought to hold hundreds of millions of tonnes of ice.

Chandrayaan-1's camera photographed the landing site of which 1971 mission, the first to drive a lunar rover?

Apollo 15's Hadley Rille site showed up in the Indian camera's five-metre-resolution images, helping answer conspiracy theorists as a bonus.

Chandrayaan-1's impact probe struck near which south-pole crater, named after an Antarctic explorer?

Shackleton crater's rim is lit almost continuously while its floor never sees the Sun, which is why NASA's Artemis planners eye it too.

Which prime minister announced the Chandrayaan programme in his Independence Day speech in 2003?

Atal Bihari Vajpayee put a ₹350 crore price on the project that day, and his successor was in office by the time the first orbiter flew five years later.

Chandrayaan-3's orbit manoeuvres were commanded from ISTRAC, ISRO's tracking network, based in which city?

Bengaluru is also ISRO's headquarters city, and the prime minister flew there three days after the landing to meet the mission team.

India's main spaceport was renamed in 2002 in tribute to which former ISRO chairman, who had died that year?

Satish Dhawan ran ISRO from 1972 to 1984 and famously took the blame for a failed 1979 launch in public, then let his project director take the credit when the next one flew.

Which engineer was Chandrayaan-2's project director, the first woman to lead an ISRO mission to another world?

Muthayya Vanitha was named one of five scientists to watch by the journal Nature in 2019, with Ritu Karidhal serving beside her as mission director.

Chandrayaan-1's Moon Impact Probe hit the surface after a 25-minute fall at roughly what speed?

About 6,100 km/h, or 1.69 km every second, was the impact speed, and the probe kept sampling the thin lunar atmosphere all the way down.

India's prime minister watched Chandrayaan-3's landing by video link from a BRICS summit in which country?

South Africa was hosting the 15th BRICS summit in Johannesburg, and the prime minister waved a tricolour on screen the moment the lander touched down.

How many 800-newton thrusters did Chandrayaan-3's lander descend on, one fewer than its 2019 predecessor?

Four engines matched the lander's four legs, which were also strengthened to survive a touchdown at up to 3 metres per second after the 2019 crash.

NASA supplied which passive instrument to Chandrayaan-3's lander, letting orbiters bounce beams off it for decades?

A laser retroreflector array needs no power, so it will still be marking the exact landing spot long after every other instrument on the lander is dead.

Chandrayaan-3's landing site, often called 'at the south pole', actually lies roughly how far from the pole?

About 600 km from the pole still put the lander at 69° south, farther south than any previous soft landing, between the craters Manzinus C and Simpelius N.

What name did India give the spot where Chandrayaan-2's lander crashed in 2019, after the national flag?

Tiranga Point means 'tricolour point', and the name was announced in 2023 on the same day the successful Chandrayaan-3 site got its own.

Which former president, a rocket engineer himself, proposed adding an impact probe to Chandrayaan-1?

A. P. J. Abdul Kalam argued that an orbiter already flying so close should leave something on the surface, and the probe he championed carried the Indian flag painted on its sides.

Who chaired ISRO from 2003 to 2009, the years that took Chandrayaan-1 from announcement to orbit?

G. Madhavan Nair's tenure also saw the start of India's human spaceflight programme, and he left office two months after the orbiter went quiet.

Carle Pieters of which Ivy League school led NASA's Moon Mineralogy Mapper team on Chandrayaan-1?

Brown University's instrument produced the first high-resolution mineral map of the entire lunar surface, an unexpected bonus from an Indian-built orbiter.

Ten days after Chandrayaan-3 landed, ISRO launched which probe, its first mission dedicated to studying the Sun?

Aditya-L1 now sits about 1.5 million km from home at a gravitational balance point, watching the Sun without ever passing into shadow.

Chandrayaan-3's RAMBHA probe made the first polar surface measurement of what property of the Moon's thin ionosphere?

Plasma density near the surface turned out to be sparse, first read at 5 to 30 million electrons per cubic metre, which bodes well for radio communication there.