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Thread: China's Chang'e 4 mission

  1. #121
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    "China's lunar rover Yutu-2 resumes work after third lunar night"

    http://en.people.cn/n3/2019/0330/c90000-9562294.html

    China's lunar rover Yutu-2, or Jade Rabbit-2, has woken up from its third lunar night on the far side of the moon and resumed its scientific exploration mission.

    According to the China National Space Administration, the lunar rover woke itself up at 8:28 p.m. on Friday and re-established communications with its relay satellite.
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  2. #122
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    Yutu-2 has now traveled 170.92 meters inits new home. Unfortunately China has not released any new photos of the environment.

    http://www.xinhuanet.com/english/201..._137963322.htm

    China's lunar rover has driven 170.92 meters on the far side of the moon to conduct scientific exploration on the virgin territory.

    The rover Yutu-2, or Jade Rabbit-2, took a "noon break" from April 2 to April 8, as the temperatures on the moon were extremely high, and continued its exploration, according to the Lunar Exploration and Space Program Center of the China National Space Administration.
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  3. #123
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    Yutu-2 has goon to sleep again.

    http://www.moondaily.com/reports/Chi..._mode_999.html

    The lander and the rover of the Chang'e-4 probe switched to dormant mode for the lunar night on Friday, with the rover traveling an accumulated 178.9 meters on the far side of the moon.

    The rover Yutu-2, or Jade Rabbit-2, is expected to awaken again on April 28, and the lander to awaken the following day, according to the Lunar Exploration and Space Program Center of the China National Space Administration.
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  4. #124
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    China defends the speed of Yutu-2.

    Goes anyone have the speed of the US and Russian rovers on the moon and the US rovers on Mars.

    http://www.ecns.cn/news/2019-04-17/d...a9211955.shtml

    As of Thursday, the Yutu II lunar rover has "walked" a total of 178 meters on the moon, Sun said.

    Some may question the speed of the lunar rover, given it landed on the far side of the moon in January, four months ago.

    "Yutu II is not slow at all," Pang Zhihao, an expert in space exploration technology, told the Global Times on Tuesday, saying that the rover prioritizes safety on the lunar surface by design and it is selecting the most research-valuable path through a rather comprehensive calculation, which takes time.
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  5. #125
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    At last, some new pictures from Tutu-2.

    http://www.planetary.org/blogs/guest...tes-day-4.html

    China’s Chang’e-4 lander and Yutu-2 rover are continuing to function well and have completed their fourth lunar day since landing on the far side of the Moon on 3 January 2019 this year.

    Though no real science results have emerged yet, scientists involved stated in correspondence (paywall) to Nature Geoscience that the landing site shows "potential evidence of excavated deep mafic material, which could reveal the mineralogy of the lunar mantle."
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  6. #126
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    "A Dutch radio antenna on the farside of the Moon has successfully provided its first data."

    http://www.leonarddavid.com/farside-...na-first-data/

    The Netherlands-China Low-Frequency Explorer (NCLE) is onboard China’s Queqiao relay satellite in a halo orbit about the Earth-Moon L2 Lagrange point.

    From that position, Queqiao is enabling communications between the China’s Chang’e-4 farside lander and Yutu-2 rover and the Earth.

    NCLE is an instrument designed to measure radio waves from the Universe and was developed by a team from the Radboud Radio Lab of the Radboud University, the Netherlands Institute for Radio Astronomy (ASTRON) and the company Innovative Solutions in Space (ISIS).
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  7. #127
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    "China's Chang'e-4 probe resumes work for fifth lunar day"

    http://www.xinhuanet.com/english/201..._138021848.htm

    The lander and the rover of the Chang'e-4 probe have resumed work for the fifth lunar day on the far side of the moon after "sleeping" during the extreme cold night.

    The lander woke up at 7:40 a.m. Monday, and the rover, Yutu-2 (Jade Rabbit-2), awoke at 1:45 p.m. Sunday. Both are in normal working condition, according to the Lunar Exploration and Space Program Center of the China National Space Administration.
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  8. #128
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    Quote Originally Posted by selvaarchi View Post
    Yutu-2 has now traveled 170.92 meters inits new home. Unfortunately China has not released any new photos of the environment.

    http://www.xinhuanet.com/english/201..._137963322.htm
    Ever wondered how far our other rovers traveled on the moon and Mars? Wonder no more, NASA has the answers.

    https://ourplnt.com/driving-distance...-moon-records/

    This chart, prepared by NASA illustrates comparisons among the driving distances by various wheeled vehicles on the surface of the planetary bodies other than Earth (as of February 13, 2019, only the moon and Mars). Opportunity rover, which declared dead after record-breaking 15-years on the Martian surface also holds the off-Earth roving distance record after accruing 45.16 kilometers (28.06 miles) of driving on Mars.
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  9. #129
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    The rover has added another 12 meters on its journey on the moon and now has gone to sleep for another 14 days.

    http://www.xinhuanet.com/english/201..._138051093.htm

    China's lunar rover Yutu-2 has driven 190.66 meters on the far side of the moon to conduct scientific exploration on the virgin territory.

    Both the lander and the rover of the Chang'e-4 probe switched to dormant mode for the lunar night on Saturday, according to the Lunar Exploration and Space Program Center of the China National Space Administration.
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  10. #130
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    "China’s SmallSat Lunar Mission Longjiang-2 to Deorbit on 31 July"

    http://www.planetary.org/blogs/emily...sat-lunar.html

    According to amateur spacecraft tracker Daniel Estévez, Longjiang-2 will crash into the Moon on 31 July after more than a year in lunar orbit. Longjiang-2 is one of a pair of small satellites that launched to the Moon along with the Chang’e-4 relay satellite Queqiao on 21 May 2018. Longjiang-2’s partner Longjiang-1 failed to enter lunar orbit, but Longjiang-2 succeeded, and amateur radio operators on Earth have been commanding it to take cool photos ever since.
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  11. #131
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    Yutu-2 may have only traveled 190.66 meters on the lunar surface but is providing a bountiful of scientific data. 4 articles from - China, "nature", "National Geographic" and "Scientific American" tell the story.

    http://www.xinhuanet.com/english/201..._138062999.htm

    China's Yutu-2, the first rover on the far side of the moon, has found materials from deep inside the moon that could help unravel the mystery of the lunar mantle composition and the formation and evolution of the moon and the earth.

    Using data obtained by the visible and near infrared spectrometer installed on Yutu-2, a research team led by Li Chunlai, with the National Astronomical Observatories of China under the Chinese Academy of Sciences, found that the lunar soil in the landing area of the Chang'e-4 probe contains olivine and pyroxene which came from the lunar mantle deep inside the moon.

    The first important scientific discovery of the Chang'e-4 probe since it made the first-ever soft landing on the far side of the moon was published online in the latest issue of the academic journal Nature.
    https://www.nature.com/articles/s41586-019-1189-0

    Over 60 years of spacecraft exploration has revealed that the Earth’s Moon is characterized by a lunar crust1 dominated by the mineral plagioclase, overlying a more mafic (richer in iron and magnesium) mantle of uncertain composition. Both crust and mantle formed during the earliest stages of lunar evolution when late-stage accretional energy caused a molten rock (magma) ocean, flotation of the light plagioclase, sinking of the denser iron-rich minerals, such as olivine and pyroxene, and eventually solidification2. Very large impact craters can potentially penetrate through the crust and sample the lunar mantle. The largest of these craters is the approximately 2,500-kilometre-diameter South Pole-Aitken (SPA) basin3 on the lunar far side. Evidence obtained from orbiting spacecraft shows that the floor of the SPA basin is rich in mafic minerals4, but their mantle origin is controversial and their in situ geologic settings are poorly known. China’s Chang’E-4 lunar far-side lander recently touched down in the Von Kármán crater5,6 to explore the floor of the huge SPA basin and deployed its rover, Yutu-2. Here we report on the initial spectral observations of the Visible and Near Infrared Spectrometer (VNIS)7 onboard Yutu-2, which we interpret to represent the presence of low-calcium (ortho)pyroxene and olivine, materials that may originate from the lunar mantle. Geological context6 suggests that these materials were excavated from below the SPA floor by the nearby 72-km-diameter Finsen impact crater event, and transported to the landing site. Continued exploration by Yutu-2 will target these materials on the floor of the Von Kármán crater to understand their geologic context, origin and abundance, and to assess the possibility of sample-return scenarios.
    https://www.nationalgeographic.com/s...e-moon-mantle/

    Kicking off the new year with a bang, China made history in early January by landing the first-ever spacecraft on the far side of the moon. Now, results from that mission suggest another bombshell: the first signs of lunar mantle material available for scientific study.

    Yutu-2, the rover partner to the Chang’e-4 lander, used reflected radiation to analyze the minerals within its landing site inside the moon’s Von Kármán crater. In doing so, it spotted layers rich in two mineral types that aren’t a match for typical lunar crust. The study authors argue that it is likely these mineral patches represent upper mantle material, according to work appearing today in the journal Nature.

    If confirmed, mantle rock from the moon would give researchers a game-changing look at our celestial companion’s inner workings, perhaps helping to solve long-standing mysteries about the moon’s formation and evolution. (Find out why geologists now think the moon may be more tectonically active than previously realized.)
    https://www.scientificamerican.com/a...hidden-depths/

    In the 1960s and 1970s, the United States and the Soviet Union conducted unprecedented lunar exploration programs that remain unmatched to this day. The American crewed Apollo landings were complemented by uncrewed Soviet landings, with both yielding revolutionary bounties of scientific data, such as the hundreds of kilograms of lunar rock and soil that the missions returned to Earth. Oddly missing from all those samples, however, was any material that indisputably originated from the moon’s rocky mantle. Lying just beneath the cratered, desolate crust, the moon’s upper mantle is thought to be the frozen remnant of a vast magma ocean that existed more than 4 billion years ago. Directly studying samples of the mantle could unlock previously hidden chapters of lunar history, potentially reshaping our broader understanding of planetary formation and evolution. Now, a Chinese mission has discovered signs of mantle material at the moon’s surface, effectively setting an “X” on lunar maps for future explorers seeking this not-so-buried geological treasure.
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  12. #132
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    Quote Originally Posted by selvaarchi View Post
    Yutu-2 may have only traveled 190.66 meters on the lunar surface but is providing a bountiful of scientific data. 4 articles from - China, "nature", "National Geographic" and "Scientific American" tell the story.
    I stand corrected- the observations were made on Yutu-2's 1st lunar day!

    http://www.planetary.org/blogs/guest...iscovered.html

    The paper was submitted in February, meaning it is based only on observations of lunar soil made in the first lunar day of the mission. Chang’e-4 and Yutu-2 have recently concluded their fifth lunar day of activity. During day 3, Yutu-2 was understood to have approached rocks for analysis by VNIS.
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  13. #133
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    "China's Chang'e-4 probe resumes work for sixth lunar day"

    http://www.xinhuanet.com/english/201..._138099697.htm

    The lander and the rover of the Chang'e-4 probe have resumed work for the sixth lunar day on the far side of the moon after "sleeping" during the extremely cold night.

    The lander woke up at 6 p.m. Tuesday, and the rover, Yutu-2 (Jade Rabbit-2), awoke at 2:16 a.m. Tuesday, according to the Lunar Exploration and Space Program Center of the China National Space Administration.

    For the sixth lunar day, the lander's neutron radiation detector and low-frequency radio detector will be restarted to conduct scientific tasks including particle radiation observation and low-frequency radio astronomical observation.
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  14. #134
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    Yutu-2's moto is "slow and steady wins the race" It did another 22.66 meters in the last 14 days before going to sleep on Sunday.

    http://www.xinhuanet.com/english/201..._138131399.htm

    China's lunar rover Yutu-2 has driven 212.99 meters on the far side of the moon to conduct scientific exploration on the virgin territory.

    Both the lander and the rover of the Chang'e-4 probe switched to its dormant mode for the lunar night late on Sunday (Beijing time), according to the Lunar Exploration and Space Program Center of the China National Space Administration.
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    NASA's Lunar Reconnaissance Orbiter (LRO) is keeping an eye on Chang'e-4.

    http://www.leonarddavid.com/nasa-moo...rside-mission/

    NASA’s Lunar Reconnaissance Orbiter (LRO) has snapped new imagery of China’s Yutu-2 rover that is still on the move!

    The orbiter’s Lunar Reconnaissance Orbiter Camera (LROC) shows the wheeled rover about 426 feet (130 meters) west of the Chang’e-4 lander.

    Once a month, LRO passes over the Chang’e 4 landing site, allowing LROC to capture a new image. LROC has now imaged the site five times (since the landing) on January 3 and observed Yutu-2 to have traveled a total of 610 feet (186 meters) – the distance measured using the rover tracks.
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  16. #136
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    Andrew Jones on Chang'e-4. From the picture taken by Chang'e-4, you can make out that the rover is not traveling in a straight line. You can make out three areas where it has moved in circles. No explanation given for this movement.

    https://spacenews.com/change-4-begin...ic-challenges/

    The Chang’e-4 lander and Yutu-2 rover resumed science and exploration activities June 27 for the start of the mission’s seventh lunar day on the far side of the moon.

    The 140-kilogram Yutu-2 (Jade Rabbit-2) rover awoke at 1:26 a.m. Eastern, followed by the lander at 9:45 p.m., with both spacecraft and their science payloads working normally, according to an update from the Lunar Exploration and Space Program Center of the China National Space Administration issued Thursday.

    The spacecraft had powered down on the morning of June 9, folding solar arrays in preparation for the 14.5-Earth-day-long lunar night, during which the pair use radioisotope heater units to protect against temperatures as low as minus 190 Celsius (minus 310 Fahrenheit).
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  17. #137
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    Quote Originally Posted by selvaarchi View Post
    Andrew Jones on Chang'e-4. From the picture taken by Chang'e-4, you can make out that the rover is not traveling in a straight line. You can make out three areas where it has moved in circles. No explanation given for this movement.
    My guess is a rock caught in the wheels, or photographing an interesting spot from different angles.

  18. #138
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    Chang'e-4 mission is using a chip made by ESA.

    http://www.esa.int/spaceinimages/Ima...ang_e-4_lander

    At a time when ESA is looking forward to future lunar exploration, it turns out there is already some small but crucial ESA-developed hardware in operation on the far side of the Moon.

    China’s Chang’e-4 lander is running on a LEON2-FT microprocessor core, especially designed for space missions by ESA and sold commercially by the Microchip company – marketed as the AT697.

    The ordinary computer chips you use every day in your phone or laptop would be rapidly degraded by the radiation and environmental extremes of space. Specialised chips are therefore essential for spacecraft

    Chang’e-4 touched down inside the Von Kármán crater on the Moon’s far side near the south pole on 3 January 2019. The lander and the rover it delivered are currently hibernating during the lunar night, having survived seven month-long lunar days so far.

    “Most ESA missions launched after about 2010 include at least one LEON chip, and hundreds of these radiation-hardened off-the-shelf chips have also been sold to space missions both in Europe and around the globe,” explains ESA microelectronics engineer Agustin Fernandez-Leon.
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  19. #139
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    Quote Originally Posted by selvaarchi View Post
    Yutu-2's moto is "slow and steady wins the race" It did another 22.66 meters in the last 14 days before going to sleep on Sunday.

    http://www.xinhuanet.com/english/201..._138131399.htm
    After the 6th day Yutu-2 did 212.99 meters. Now as it wakes up for the 8th day, the report shows only 210 meters travelled! Has Yutu-2 got a problem with its wheels like Yutu-1?

    http://www.moondaily.com/reports/Chi...h_day_999.html

    The Chinese moon mission that includes the lander Chang'e-4 and rover Yutu 2 (Jade Rabbit 2) awoke to begin their eighth month of work on the far side of the Moon, the China National Space Administration (CNSA) said on Saturday.

    "The Chang'e-4 lander successfully awoke from dormant mode on Friday, 7:12 p.m. Beijing time [11:12 a.m. GMT] and began the eighth month of work on the Moon. The payloads on board, including radiation and neutron dosimeters and a low-frequency radio spectrograph, will turn on sequentially, and the research will be conducted as scheduled", the statement read.

    According to the statement, the Yutu 2 lunar rover awoke slightly earlier and its payload will restart shortly in order to carry out the planned work. It is equipped with a high-resolution camera that transmits unique pictures of the Moon's dark side.

    As of today, the rover has travelled more than 210 meters (689 feet), the statement added.
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  20. #140
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    How much did Chang'e-4 cost?

    http://www.ecns.cn/news/sci-tech/201...q8702425.shtml

    Recently, CGTN Digital received questions from readers about the cost of China's Chang'e-4 lunar mission.

    So how much money did China spend on building the Chang'e-4 lunar lander, the Yutu-2 lunar rover and the rocket to send them to the far side of the Moon?

    According to Wu Yanhua, deputy director of the project, the total cost of the mission was "not much."

    "The cost is close to building one kilometer of subway," he said in a press conference back in January 2019.

    The cost-per-kilometer of subway in China varies from 500 million yuan (about 72.6 million U.S. dollars) to 1.2 billion yuan (about 172.4 million U.S. dollars), based on the difficulty of construction.

    So we still don't have the exact number, but the range is close enough to give people a solid estimation of the cost of a Moon trip.

    By comparison, India's ongoing Chandrayaan-2 mission has already cost about 141 million U.S. dollars.
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  21. #141
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    "China's micro lunar orbiter crashes into Moon under control"

    http://www.chinadaily.com.cn/a/20190...e355638fe.html

    China's micro lunar orbiter Longjiang-2 has crashed into the Moon under ground control after it completed its mission, according to the Lunar Exploration and Space Program Center of the China National Space Administration.

    The micro satellite crashed into a predetermined area on the far side of the Moon at 10:20 pm on July 31 (Beijing Time), the center said Friday.
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  22. #142
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    Andrew Jones on China's micro lunar orbiter Longjiang-2.

    http://www.planetary.org/blogs/guest...acts-moon.html

    At 14:08 UTC on 31 July, Longjiang-2, also known as DSLWP-B, passed behind the Moon for the last time. Half an hour later, with an absence of new signals to indicate a reappearance, it was clear that the Moon had lost an orbiter and gained a new crater on its far side. According to a prediction by Daniel Estévez, the 50-centimeter-tall, 47-kilogram DSLWP-B satellite impacted at 14:20 UTC.

    Not to worry—this was a planned measure to prevent potential collisions or debris for future missions. A maneuver performed 24 January lowered the periapsis of the satellite’s lunar orbit by about 500 kilometers, with orbital perturbations over time seeing the satellite impacting the Moon Wednesday after 432 days in lunar orbit.
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  23. #143
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    Quote Originally Posted by selvaarchi View Post
    After the 6th day Yutu-2 did 212.99 meters. Now as it wakes up for the 8th day, the report shows only 210 meters travelled! Has Yutu-2 got a problem with its wheels like Yutu-1?

    http://www.moondaily.com/reports/Chi...h_day_999.html
    Happy to report, I was wrong. Yutu-2 has travelled another 51 meters

    http://www.xinhuanet.com/english/201..._138292871.htm

    China's lunar rover Yutu-2 has driven 271 meters on the far side of the moon to conduct scientific exploration on the virgin territory.

    Both the lander and the rover of the Chang'e-4 probe switched to its dormant mode for the lunar night on Wednesday (Beijing time), according to the Lunar Exploration and Space Program Center of the China National Space Administration.
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  24. #144
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    Chang'e-4 is awake for the 9th lunar day.

    http://www.xinhuanet.com/english/201..._138337316.htm

    The lander and rover of the Chang'e-4 probe have resumed work for the ninth lunar day on the far side of the moon after "sleeping" during the extremely cold night.

    The lander woke up at 8:10 a.m. Sunday, and the rover, Yutu-2 (Jade Rabbit-2), awoke at 8:42 a.m. Saturday, according to the Lunar Exploration and Space Program Center of the China National Space Administration.

    For the ninth lunar day, the lander's neutron radiation detector and low-frequency radio detector, as well as the rover's infrared imaging spectrometer and other instruments will be restarted to conduct scientific tasks including moon surface observation and composition analysis.
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    From Smithsonian

    On July 28, China’s Yutu-2 lunar rover prepared to power down for its daily nap to protect itself from the midday sun during its mission to study the far side of the moon. Before it could finally shut down, one of its handlers here on Earth noticed something strange in one of the panoramic images the moon robot had taken. Inside a small crater there appeared to be a strangely colored substance with a “gel-like” consistency.

    The rover team scrapped their plans for rest to investigate the crater, examining the lustrous spot with Yutu’s Visible and Near-Infrared Spectrometer (VNIS), reports Andrew Jones at Space.com. The results of that analysis, however, have not been released nor have images of the mystery substance. News of the substance appeared on the Chinese-language Yutu-2 “drive diary” on the website Our Space and was tweeted out by the state-run newspaper People’s Daily.

    In the absence of details, the announcement has led to speculation. The most likely explanation, Jones reports, is that the lustrous spot isn’t really a gel, but is some form of shiny melted glass created when a meteorite struck the moon.
    I'd have to vote for a glass of some sort too, rather than a gel. Almost wonder if this is a bit of a translation error. Still, an interesting find.
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  26. #146
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    Yutu-2 keeps making steady progress - as the saying goes - slow and steady wins the race (not sure what race)

    http://www.xinhuanet.com/english/201..._138372596.htm

    China's lunar rover Yutu-2 has driven 284.66 meters on the far side of the moon to conduct scientific exploration on the virgin territory.

    Both the lander and the rover of the Chang'e-4 probe switched to its dormant mode for the lunar night on Friday (Beijing time), according to the Lunar Exploration and Space Program Center of the China National Space Administration.
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