Cosmos is the another name for the universe. Cosmos is a container or place that contains every visible thing.
Why cosmos?
The word cosmos is used to denote the universe as a complex and orderly system or entity.
Cosmos is an egg
As per the ancient philosophy & concepts, Cosmos is an egg.
There exist three Cosmos
There are three cosmos in the whole existence, one is the gross cosmos or physical cosmos, which we can see with our eyes.
Beyond gross cosmos there exist subtle cosmos, and beyond subtle cosmos , there exist causal cosmos.
Creation & dissolution of cosmos
As particles are generated and dissolved, three cosmoses are created and dissolved, under the command of eternal cosmic law, with corresponding time cycles.
According to the Rigveda Philosophy,
As none others existed prior to creation except the creator GOD, the only source is divine treasure of wisdom, the divine wisdom mantras or the Veda, as Veda is from GOD. So the Veda mantras are the source.