Where are the Cosmic Chests in Fortnite?

Cosmic Chests in Fortnite is a strange new way to get loot in the newly released Season 7 of Chapter 2.
Where Are The Cosmic Chests in Fortnite?
There is no exact location where Cosmic Chests will spawn, being completely random in each new game you load into. Luckily, at the start of every game, a location will be marked on your map with an indicator showing you where a Cosmic Chest has spawned.
If someone in your squad comes across a Cosmic Chest, the rest of your squad will be notified with: "A teammate just found a Cosmic Chest! They need your help to open it!"
Now, how to get your hands on that sweet Cosmic Chest loot?
To crack open a Cosmic Chest, it's necessary that you bring along a couple of friends to assist you in breaking the crystal encasing the chest.
Even if all four squad members are hitting the crystal in attempts to break it, only certain members of the squad will see the blue circle weak points you must hit to break the crystal. This turns into a mini-puzzle where squad members must determine who has the weak points at what moments to successfully time the hits, granting access to the Cosmic Chest.