Name: 嫦娥四號任務的新影像照亮了月球的遠方。 (Chang’e 4 Mission’s New Images Illuminate the Far Side of the Moon)
Uploaded: 2021-01-14T10:47:08.000Z
Duration: 3 min 49 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

China's Chang'e-4 lander was the first spacecraft to make a soft landing on the far

side of the moon back in  January of 2019.

To mark its one year anniversary, the Chinese Academy of Sciences released a trove of data

and photos of the rarely-seen  side of the moon.

But aside from taking pretty pictures, what has Chang'e-4 been doing up there?

Well, the first notable thing it's done is just survive for a year.

The original design life of the lander's rover, Yutu-2, was just 3 months.

That means the little six-wheeler has been up there kicking moon dust

Not bad, considering the lander and rover were modified spares

had on hand in case the Chang'e-3 mission was unsuccessful.

The longevity is also impressive  when you remember

One full day-night cycle on the moon is about 29 and a half days, so that's over 14 days

of continuous sunshine followed by more than 14 days of darkness.

When the long night comes, Chang'e-4 and Yutu-2's solar panels don't generate enough

electricity to run its instruments and systems.

The crafts have to power down and hibernate for almost two weeks, just staying alive thanks

Basically, a nuclear powered electric blanket.

Compare that long night to Mars, where rovers have to deal with a full day-night cycle that's

only about 40 minutes longer than a day on Earth.

But it's not just the long, cold, lonely lunar nights that threaten the mission.

High noon on the moon is also hot enough to damage the rover, so it shuts down for about

six days at a time while the sun is directly overhead, heat-blasting it.

That's right: it takes a little nap in the middle of the day.

I never thought I could relate to a spacecraft so much.

Sleeping as much as an average teenager is part of what's allowed the Yutu-2 rover

Yutu-1, the rover it's almost identical to, remember, short circuited and conked out

Meanwhile, Yutu-2 set a record for longevity back in November, and is still going strong.

So don't let anyone make you feel guilty about needing a nap.

The longer the rover and lander survive, the longer both can perform experiments with the

Yutu-2 has been studying the lunar regolith as it rolls along with Lunar Penetrating Radar

that can see more than 100 meters down, and a Visible and Near-infrared Imaging Spectrometer

that analyzes the mineral composition  at the surface.

Data from these instruments have shown that the Von Karman crater where Chang'e-4 touched

down has thicker regolith than the near side of the moon, and the spectrometer has detected

minerals that appear to have come from the mantle below the moon's crust.

Continued study and analysis could lend insights into how the moon evolved.

The lander itself is taking measurements of radiation levels on the moon, and the same

instrument can be used to measure the amount of water in the local lunar soil.

However the experiment I am most excited about is the one that really takes advantage of

The lander's Low Frequency Spectrometer is made up of three 5 meter long antennae

that are observing low-frequency waves from the sun, the lunar ionosphere, interplanetary

It can do this in the relative radio quiet on the far side of the moon, since the moon's

body blocks the noisy signals we're constantly beaming off from Earth.

Unfortunately the antennae only deployed last November,

Maybe on Chang'e-4's two-year anniversary, after a lot more naps, it'll have another

While Yutu-2 has set the record for longest time driving on the moon, the record holder

for distance belongs to the soviet rover Lunokhod-2.

Thanks for watching, don't forget to subscribe and if you want to know more about the history

of Chang'e-4 check out my other video here.