2022-06-28

Jade rabbit 2 found”dragon’s back”! Who left it? What is hidden behind the moon?

By yqqlm yqqlm
ten thousand and eighty-six

At present, China’s yutu-2 lunar rover has been working on the back of the moon for more than 3 years, far exceeding the design life of 3 months. By the day of the 41st month,Jade rabbit two的总行驶里程达到了1142米。现在月球背面的黑夜已过,Jade rabbit two和嫦娥四号已进入了第42个Moon day

在第41个Moon day期间,Jade rabbit two前去探测了备受科学家感兴趣的”Dragon Ridge”。那么,Jade rabbit two所发现的”Dragon Ridge”究竟是什么东西呢?是“谁”留下的呢?为什么月球背面会这么神秘呢?

ten thousand and eighty-seven

At noLunar probeAt that time, human cognition of the back of the moon was completely blank, because the back of the moon could never be seen on earth. But we know that the moon has day and night, that is to say, the moon is rotating, so why can’t we see the other side of the moon?

The mysterious back of the moon

The moon does indeed rotate. The time it rotates around its axis is 27.322 Earth days. Just as the earth has both rotation and revolution, the moon will orbit in addition to rotationEarth revolution, andRevolution PeriodIt happens to be 27.322 days, andRotation periodExactly the same. Why is there such a coincidence?

ten thousand and eighty-eight

这种现象其实并非巧合, and是地球对月球产生的潮汐锁定现象。数十亿年前,月球最初的自转和公转速度都要比现在快得多, and且距离地球也要近得多,只有几万公里。

Under the action of the earth’s gravity, the moon is pulled into an ellipsoid, forming tidal bulges on both sides facing and facing away from the earth. stayLunar rotation过程中,潮汐隆起部分会阻碍Lunar rotation,消耗月球的自转angular momentum, causing the moon to spin more slowly.

ten thousand and eighty-nine

反过来月球引力也会让地球产生潮汐隆起,地球自转也会变慢。由于angular momentum守恒,地球损失的自转angular momentum会转移给月球,导致月球的公转angular momentum变大,月球逐渐远离而去。

最终,自转和公转角速度变得越来越慢,直至两者的速度保持相同,此时月球被潮汐锁定。在这种情况下,月球永远有一面正对着地球, and另一面背对着地球。事实上,这种现象在太阳系中普遍存在,JupiterSaturn等巨行星的多颗卫星都被潮汐锁定, andPlutoAnd its satellite Charon also had a special phenomenon of mutual tidal locking.

ten thousand and ninety

Because the back of the moon is always facingEarth Moon systemIn addition, it is more vulnerable to asteroid impact from outside. The dense craters there are the best proof. The front of the moon is mostly flatMoon sea, the number of craters is much smaller.

ten thousand and ninety-one

虽然人类早已发射过Lunar probe,拍摄到了月球背面的景象,也有宇航员亲眼看到月球背面,但无论是探测器,还是宇航员,从未登陆过月球背面。直到我国发射嫦娥四号,人类的探测器才第一次登陆月球背面,随之而来的还有Jade rabbit twolunar rover。

“Dragon Ridge”

ten thousand and ninety-two

为了揭开月球背面的神秘面纱,Jade rabbit two开始了史无前例的月球背面探测之旅。此前,Jade rabbit two在月球背面发现了奇奇怪怪的东西,包括“石碑”、“神秘小屋”、“石兔子”、粘稠月壤、MeteoriteTransparent glass beads.

就在几个Moon day前,Jade rabbit two发现远处月表上有一块黑色凸起物体,就像我国传说的龙背部鳍片,科学家给它取了一个响亮的名称:”Dragon Ridge”。由于”Dragon Ridge”形状独特,Jade rabbit two打算前去近距离探究一番。

ten thousand and ninety-three

虽然直线距离看起来不是很远,估计只有几十上百米,但Jade rabbit two要走过去相当不容易。因为”Dragon Ridge”周围遍布Meteorite坑, and且地势不平坦,科研人员需要谨慎选择路线,非常小心地控制Jade rabbit two前进。

在大约两周的Moon day期间,Jade rabbit two的总行驶距离一般只有二三十米。虽然Jade rabbit two的行驶速度可达5.6厘米/秒,这意味着每小时可以走200米,但它并不能一直保持高速行驶。

ten thousand and ninety-four

如上所述,Jade rabbit two走在地形复杂的月面上,每走一步都要十分小心,需要走走停停。而且行驶太快的话,月尘可能会被卷入电机中,导致lunar roverThe yutu-1 stopped working on the front of the moon because of this.

ten thousand and ninety-five

经过数个Moon day的艰难“长途跋涉”,跨越重重障碍,Jade rabbit two终于来到了”Dragon Ridge”面前,原来这是一块凸出月表的石头。”Dragon Ridge”有可能像此前发现的“石碑”那样,是由小行星撞击留下的残骸,当然也有可能是其他成因。Jade rabbit two用红外仪器对这块石头进行了探测,科学家将会对获取的数据进行分析,以揭示它的起源。

ten thousand and ninety-six

Jade rabbit two的月球背面探测之旅还在继续,接下来几年,我国还将陆续发射Chang’e 6、七号、八号Lunar probe,其中Chang’e 6将在月球背面登陆,在那里采集Lunar rockAnd lunar soil, and then back to earth. At that time, more unsolved mysteries on the back of the moon will be revealed.