The vast universe is full of mysteries waiting to be discovered.
Meaning: This means that the universe is very big and there are many things that we don't know about it yet.
Choice of Words: Vast means very large or extensive. Universe is the entire space and time in which we live. Mysteries are things that are difficult or impossible to understand. Waiting means staying in a place or position until something happens. Discovered means to find something that was previously unknown.
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