Meaning: Space is very large and contains nothing.
Choice of Words: Space is the boundless three-dimensional extent in which objects exist and events occur, and vast means extremely large in size or amount, and empty means containing nothing.
Alternative Expressions
Space is vast and empty.
Meaning: Imagine a giant room with nothing inside. That's what space is like. It's a huge, empty area.
Choice of Words: The word "vast" means very large or enormous, and the word "empty" means having nothing in it. So, "space is vast and empty" means that space is very big and there's nothing inside it.
Space is like a giant empty box.
Meaning: Think of a really big box that goes on forever in all directions. That's what space is like.
Choice of Words: A "box" is a container that has sides and a bottom but no top. So, comparing space to a giant empty box helps us understand that it's a huge area that's empty and has no boundaries.
Space is like a never-ending ocean of nothingness.
Meaning: Imagine an endless ocean that has no water. That's what space is like. It's a giant empty area that stretches out forever.
Choice of Words: An "ocean" is a huge body of water that covers a large area. The word "nothingness" means nothing exists. So, comparing space to a never-ending ocean of nothingness helps us understand that it's a vast, empty area that goes on forever.