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Print 53 comment(s) - last by Argon18.. on Feb 24 at 12:41 PM

Extreme temperatures killed it

RIP lunar rover Yutu.
 
According to New Scientist, China's lunar rover Yutu -- also called Jade Rabbit -- was pronounced dead this week, ending its three-month mission to the moon earlier than expected. 
 
The cause of death was exposure to extreme temperatures, as a malfunction prevented Yutu from protecting its sensitive systems through the moon's daytime highs and nighttime lows. 
 
Yutu made its way to the moon December 14, 2013 when it hitched a ride from China's Chang'e-3 lander. Yutu successfully entered hibernation mode the first lunar night, where a mast folds down and a radioactive heat source protect delicate instruments. A solar panel is also angled towards the point where the sun will rise, which keeps up Yutu's power levels. 
 
It's important to note that a lunar night lasts for half of each Earthly month. Also, surface temperatures fluctuate from daytime highs of 90 °C to below -180 °C.
 
The second lunar night came January 25, and while the lander successfully went into hibernation, Yutu was unable to enter the sleep mode crucial for protecting itself from the dangerous temperatures.


Yutu [SOURCE: Universe Today]

All China could do was wait until the new lunar day, which began Monday. It's impossible to communicate with Yutu during a lunar night. 
 
As it turns out, Yutu couldn't handle the temperature fluctuations, and was declared dead this week. 
 
China's space agency believes lunar dust might've caused the malfunction, since the grains have sharp edges capable of interrupting Yutu's daily operations. 
 
Back in 2011, China released a paper that described China's five-year plan, which consisted of the construction of space stations, space laboratories, ship freighters and a manned spaceship. 
 
China said it planned to use probes to explore the moon's surface as well as asteroids, planets and the sun. A spacecraft will also be used to study black holes and celestial bodies close to Earth. Space debris will be studied as well in an effort to create systems that protect spacecraft from such debris.
 
The paper added that China hopes to improve launch vehicles, meteorological satellites, communications and broadcasting to form a global satellite navigation system.

Source: New Scientist



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RE: Expected
By wordsworm on 2/14/2014 10:17:10 AM , Rating: 2
And yet they are doing what the US cannot.


RE: Expected
By drycrust3 on 2/14/2014 12:11:21 PM , Rating: 2
Exactly. Regardless of whether Yutu is now fully functional or not, the plain fact is it is the most advanced robot on the moon. Whether it does or doesn't live out its three months of intended life isn't really the point, the point is it got there, it landed, and it worked, and that proves China's technology is amongst the best in the world.
With the moon having such a harsh environment, then it could well be the safest way of exploring the moon is with robots. As we saw with Apollo 13, if something does go wrong way out there, there is little hope of a rescue mission getting there to help. At least when a robot that dies, we don't feel the need to hold a funeral.


RE: Expected
By HomerTNachoCheese on 2/14/2014 3:51:14 PM , Rating: 2
Exactly. I cannot wait for the day when we first set foot on the moon. </sarc>

If we wanted to go to the moon again, we would, and we could. At this time, we are choosing not to spend the money for that capability. If we wanted to, we could send a spacecraft to the moon, repair Yutu, and come back. But why bother? We have bigger ambitions now.


RE: Expected
By WeslyC on 2/15/2014 12:55:47 AM , Rating: 2
What about U.S Mars rover Opportunity landed on January 25, 2004 and still operates as of Feb 2014?


RE: Expected
By wordsworm on 2/15/2014 8:59:55 PM , Rating: 2
True enough. I guess I don't like all the American hate on China all the time. China's program is going ahead very well. I think what it's been doing in the last 2-3 years has excited the extraterrestrial part of my brain. I'm still holding my breath to see them put one of their Emdrive engines to use in a satellite. Generate thrust with solar power or with the heat from the sun... which would be the most exciting thing ever to happen in space exploration. Solar energy, in space, is a lot more intense than it is here on earth.

Anyways.. back to holding my breath...


RE: Expected
By Argon18 on 2/24/2014 12:22:35 PM , Rating: 2
"And yet they are doing what the US cannot. "
No, not quite. The only reason the Chinese can do something like this is /because/ of the US. Where do you think the Chinese government got the $Billions required for such a program? You guess it, the USA. Every time you go to Wall-Mart and fill your cart with cheap Made in China crap, you are funding the Chinese government. Sometimes the Chinese government does something interesting, like put a robot on the moon.

But do not ever forget that China is a nuclear-capable Communist superpower with a military four times the size of America's. China is a fair weather friend, at best. As soon as the firehose of $$$ we're pumping into them dries up, the happy times are over.


"What would I do? I'd shut it down and give the money back to the shareholders." -- Michael Dell, after being asked what to do with Apple Computer in 1997














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