If you have read my previous article( Dark side of the moon), you might be knowing that, what this article would be all about… Well.. Go ahead and read it! If no time, here’s a quick recap… Only one side of the moon face our earth all the time, due to tidal locking. Now, let’s see how those black spots are formed on one side and no such spots on the dark side..
When we see the moon from our earth, we can see some dark spots on the moon. But when the first ever photo of the dark side of the moon was captured, unlike the side of the moon we see, it was observed that there were no dark spots on the other side of the moon!
The technical term for those black spots is MARIA. Now, the rare side or the far side consists of massive mountains but the side of the moon we see does have those black spots or MARIA, why?
Before all these, how did those blackspots were formed??
One of many theories is… A few billions of years ago, a planet sized object hit the earth and the debris due to this collision resulted in the formation of the moon. At that time Earth and moon were just two hot burning ball and as the moon was smaller compared to earth, it cooled faster than earth but the way it was cooled was uneven, this uneven cooling was because of the fact that the side of the moon that is facing the earth was still experiencing the heat due to the earth. And the side that isn’t facing the earth was cooled already, well before the side of the moon facing the Earth.
Because of this uneven cooling of the moon, one side of the moon is denser than the other, this is also responsible for the moon to slow down and causing only the bulged side of the moon to face our earth or technically the “Tidal Locking”.
When asteroids kit the moon on the dark side, massive mountains were formed, on the other hand when asteroids hit the side of the moon facing the earth, the lava eruptions took place due to the weak crust and we see the solidified lava as the black spots from the Earth.