Do you know that the moon has its own version of earthquake?  

The moon is the closest satellite that our planet has. However, we are still not entirely familiar with it. In fact, scientists are yet to be sure about how exactly it was formed in the first place. However, it cannot be denied that its existence is integral for the Earth. Here are some interesting facts about the moon that you may not have known. 

Moon was formed due to collision with a giant space object 
There is still an ongoing debate about how the moon was formed. However, one of the most widely-accepted theories related to its formation is the giant impact hypothesis. According to this hypothesis, a giant space object called Theia, which was almost as big as the planet Mars collided with our planet around 4.5 billion years ago. Due to its gravitational impact, a lot of debris and dislodged matter attached to Theia due to the gravitational force. This theory believes that this ended up forming the moon. 

The moon is slowly but surely drifting away from our planet 
According to scientists, the moon is moving approximately 3.8 cm away from the Earth annually, and it is believed that this will go on till around 50 billion years. This occurs because unlike our planet, the moon does not have atmosphere. Hence, it is subject to the effects of cosmic rays, meteorites, solar winds, extreme temperature variations, etc. which cause its movement away from the Earth. 

Similar to earthquakes, the moon has moonquakes 
The moon has moonquakes, which are its own version of earthquakes. The gravitational pull exerted by our planet is responsible for causing them. Astronauts, using seismographs, discovered that these moonquakes occurred numerous layers under its surface which lead to ruptures and cracks. According to scientists, the moon also has a molten core. 

The moon is not round, it is actually shaped like a lemon 
Most people tend to assume that the moon is round because that is what it appears like from the Earth. However, it is actually more of an oval shape. This is because billions of years ago, extremely hot tidal forces shaped its crust, with some of its areas being heated more than others. This led to its shape resembling a lemon. Moreover, over the course of numerous eons, our planet’s gravitational forces have helped to exaggerate its oblong appearance even further.