Chindia Alert: You’ll be Living in their World Very Soon
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BEIJING, May 17 (Xinhua) — China’s Chang’e-4 probe has survived 500 Earth days on the far side of the moon while conducting a scientific exploration of the virgin territory.
The lander and rover of the Chang’e-4 probe have resumed work for the 18th lunar day on the far side of the moon after “sleeping” during the extremely cold night.
The lander woke up at 3:25 a.m. Sunday (Beijing time), and the rover awoke at 11:53 a.m. Saturday. Both are in normal working order, according to the Lunar Exploration and Space Program Center of the China National Space Administration (CNSA).
The Chang’e-4 probe, launched on Dec. 8, 2018, made the first-ever soft landing on the Von Karman Crater in the South Pole-Aitken Basin on the far side of the moon on Jan. 3, 2019.
A lunar day equals 14 days on Earth, and a lunar night is the same length. The Chang’e-4 probe switches to dormant mode during the lunar night due to the lack of solar power.
The rover Yutu-2, or Jade Rabbit-2, has driven 447.68 meters, and is now 292 meters away from the lander. It has conducted scientific detection on lunar rocks, the lunar soil on its track and some impact craters.
Scientists used the Lunar Penetrating Radar on Yutu-2 to study the geological structure with a depth of 40 meters, unveiling the secrets buried under the surface of the far side of the moon, enriching our understanding about the history of celestial collisions and volcanic activities and shedding new light on the geological evolution on the moon.
Scientists also analyzed the data of the infrared imaging spectrometer on Yutu-2 and revealed the material composition on the moon’s far side, verifying that the lunar mantle is rich in olivine, which deepens our understanding of the formation and evolution of the moon.
China plans to launch its first Mars exploration mission Tianwen-1 in July. Due to the modification of the ground communication facilities, the rover and the lander will conduct in-situ detection during the 18th lunar day, said the CNSA.
The scientific tasks of the Chang’e-4 mission include conducting low-frequency radio astronomical observation, surveying the terrain and landforms, detecting the mineral composition and shallow lunar surface structure and measuring neutron radiation and neutral atoms.
The Chang’e-4 mission embodies China’s hope to combine wisdom in space exploration with four payloads developed by the Netherlands, Germany, Sweden and Saudi Arabia.
Indian Prime Minister Narendra Modi told his country’s space scientists he was proud of a programme that had come so near to putting a probe on the Moon.
Contact with Chandrayaan-2 was lost moments before its Vikram module was due to touch down at the lunar south pole.
The fate of the craft is not yet known, but Mr Modi said there would be further opportunities.
India would have been the fourth nation to make a soft landing on the Moon.
“The best is yet to come in our space programme. India is with you,” said Mr Modi.
The Chandrayaan-2 approached the Moon as normal until an error occurred about 2.1km (1.3 miles) from the surface, officials said.
Image copyright ISROImage caption The mission’s lift-off was broadcast live to an audience of hundreds of millions
India’s Space Research Organization (Isro) said it lost contact seconds before the ship was expected to land.
The country’s first Moon mission – Chandrayaan-1, in 2008 – carried out the first and most detailed search for water on the lunar surface using radars.
What happened?
Chandrayaan-2 entered the Moon’s orbit on 20 August and was due to make a controlled descent to the surface early on Saturday, Indian time, over a month after it first took off.
Staff at mission control were glued to the screens at Isro’s Bangalore space centre as the spacecraft made its descent towards the surface.
The control room burst into applause during the so-called rough breaking phase of the descent, with Prime Minister Modi watching the action from behind a glass screen.
Isro chairman Kailasavadivoo Sivan announced to staff that the ship’s initial descent had been “normal,” and that the mission’s data would be analysed.
Mr Sivan had earlier described the final descent as “15 minutes of terror”.
The rover (called Pragyan – wisdom in Sanskrit) had the capacity to travel 500m from the lander in its 14-day life span, and would have sent data and images back to Earth for analysis.
The mission would have focused on the lunar surface, searching for water and minerals and measuring moonquakes, among other things.
Why would it have been significant?
A soft landing on another planetary body – a feat achieved by just three other countries so far – would have been a huge technological achievement for Isro and India’s space ambitions, writes science writer Pallava Bagla.
He adds that it would also have paved the way for future Indian missions to land on Mars, and opened up the possibility of India sending astronauts into space.
For the first time in India’s space history, the interplanetary expedition was led by two women – project director Muthaya Vanitha and mission director Ritu Karidhal.
Media caption Is India a space superpower?
It is also a matter of national pride – the satellite’s lift-off in July was broadcast live on TV and Isro’s official social media accounts.
The mission has also made global headlines because it’s so cheap – the budget for Avengers: Endgame, for instance, was more than double at an estimated $356m. But this isn’t the first time Isro has been hailed for its thrift. Its 2014 Mars mission cost $74m, a tenth of the budget for the American Maven orbiter.
Image copyrigh tGETTY IMAGESImage caption Chandrayaan-2 is a three-in-one mission comprising an orbiter, a lander and a six-wheeled rover
India’s second Moon mission will see the country’s space agency attempt to land a rover on the lunar surface on 7 September. Science writer Pallava Bagla explains how it will reach the Moon and why it is significant.
Why is this mission unique?
Costing $150 million, Chandrayaan-2 will carry forward the achievements of its predecessor Chandrayaan-1 which was launched in 2008 and discovered the presence of water molecules on the parched lunar surface.
Chandrayaan-2 is a three-in-one mission comprising an orbiter, a lander named Vikram and a six-wheeled rover named Pragyaan.
It was launched on 22 July, a week after its scheduled blast-off, which was halted due to a technical snag.
It entered the Moon’s orbit nearly a month later in a tricky operation, completing a series of manoeuvres before its lander was cut loose on 2 September.
Media caption The successful launch of India’s Moon mission
Now, on 7 September, a little after midnight India local time (1800 GMT), the lander which contains the rover will be sent hurtling down to the lunar surface where it is expected to make a landing near the South Pole of the Moon.
The last 15 minutes of the mission, when the Vikram lander will attempt to autonomously guide itself down to the lunar surface with no support from ground control, has been described as “15 minutes of terror” by the head of the Indian Space Research Organisation (Isro), Dr K Sivan.
If India does succeed in touching down with the Vikram lander intact, it will become the fourth country to do so after the US, Russia and China.
More importantly for Indians, it will mean the nation’s flag will reach the Moon intact.
How will it land on the Moon?
The Moon may be Earth’s closest neighbour, but landing on it is a very tricky operation.
It has no atmosphere worthy of the name, which means parachutes cannot be used to slow the lander’s descent to the surface. The only option therefore is to go in for what is called a “powered descent”.
This means that the velocity of the lander is steadily reduced with its own rocket engines.
The lander will be moving horizontally across the surface of the Moon as it descends. The rocket engines must bring that horizontal movement to a stop whilst at the same time controlling the rate of descent to near zero just before the moment of touchdown.
This is known as a “soft landing”.
Before the final approach, both the orbiter and lander would have surveyed the Moon to find a “sweet spot” with no craters and boulders where it can land.
If the lander does not function properly it could crash land on the Moon surface, like its predecessor Chandrayaan-1 – though this was an intentional crash landing as in 2008 India had not yet mastered how to perform a soft landing.
Media caption Is India a space superpower?
Either way, once the landing happens and the lunar dust that may have been kicked up settles, the ramp opens up and the rover is very gently wheeled out.
The rover will then “Moon walk” at the princely speed of one centimetre per minute. It can travel a maximum of 500m (1,640ft) from the lander.
Both the lander and rover are powered with solar batteries and carry three instruments apiece.
What will the lander do?
The lander will, among other things, measure Moon quakes in its vicinity and do a thermal profile of the lunar “soil”. Meanwhile, the rover will further analyse the lunar soil.
The rear wheels of the rover are imprinted with the national emblem – the Ashoka Chakra – and the Isro logo, which means a permanent mark of India’s visit will be left on the surface of the Moon.
But the extreme temperatures on the Moon’s surface are a real challenge to the mission.
Image copyright GETTY IMAGESImage caption The rover will “Moon walk” at a speed of one centimetre per minute
When the Sun shines, the lunar temperature can cross 100C and when it sets the temperature can drop to -170C.
As their batteries must be recharged with sunlight, the nominal life of both the rover and lander is expected to be one lunar day, since Isro is not sure if they can survive the ultra-cold temperatures of the long cold lunar night which lasts 14 days.
Both will send back photos of each other so the first Indian “selfies” from the lunar surface are expected soon after they land.
Why is the South Pole of the Moon significant?
The South Pole of the Moon is still a largely unexplored area, and India is targeting a spot that no other landing craft has reached so far. The mission will attempt to soft land its rover and lander in a high plain between two craters – Manzinus C and Simpelius N – at a latitude of about 70° south.
Most earlier missions including the Apollo manned missions targeted the equatorial region of the Moon.
Isro says the lunar South Pole is especially interesting because the surface area that remains in shadow here is much larger than that of the Moon’s North Pole. This means that there is a possibility of water in areas that are permanently shadowed.
In addition, the South Pole region has craters that are cold traps and contain a fossil record of the early Solar System.
This unexplored region is also especially important because in the near future, possibly by 2024, the US space agency Nasa aims to place boots back on the Moon through its Artemis Mission, and wants to target landing near the South Pole.
India’s mission will therefore give the Americans much needed data of this unchartered territory.
Why will the orbiter circle the Moon for a year?
The Chandrayaan-2 orbiter is expected to circle the Moon for a further year.
During that time, it will map lunar minerals, take high resolution photos and search for water on the lunar surface in the most detailed fashion till date by any lunar craft, using an infra-red imager and radars.
Image copyright GETTY IMAGESImage caption The imprints of India’s national emblem and the Isro logo will be left on the Moon by the rover
The high resolution camera will help make a digital terrain map of the moon
It will also analyse the thin lunar atmosphere.
There is also the possibility that the orbiter may last longer than a year, as Isro says it has made suitable savings in fuel. But once its fuel runs out, the orbiter will become a long-lasting Indian-made lunar satellite.
CHINDIA ALERT: You'll be living in their world, very soon 