Space vs the space [closed]

Space has multiple meanings. One is the enormous dark near-vaccuum which exists outside our world, and this is never used with the definite article "the" or the indefinite article "a". It's used like a proper noun place name, except not capitalised, so you would say "I'm going to space" or "Space is very big" in the same way you would say "I'm going to London" or "New York is very big.".

An exception is when "space" is used as the first part of a noun phrase - "The space ship was quite impressive." or "A space probe was launched on wednesday". Here, "space" becomes an adjective, and again it's following the "place name" rules, like saying "The New York Mets" or "The London fog".

Another meaning of "space" is like a gap or a void, and you can use "a" or "the" with this, like

"There's a space in the middle of the page to write your name" or "The space between songs is too big on this album".

No need to use the or capitalize the s. You can use outer space to be more specific.