kosmos

/kosmos/

Cases

FormWhen to use it
nominativekosmosthe spacethe plain dictionary form — the doer of the sentence
genitivekosmosnuthe space'sthe owner — whose it is
accusativekosmosnuthe space (as the object)a specific, known object — whom or what
dativekosmoshato the spacedirection or recipient — to where, to whom
locativekosmosdaat / in the spacewhere it is; also having — mende bar, "I have it"
ablativekosmosdanfrom the spacewhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

Owned
mykosmosummy space
yourkosmosungyour space
his / herkosmosuhis / her space
ourkosmosubuzour space
you all'skosmosuğuzyou all's space
theirkosmoslarıtheir space

There is no plural of this word. The ending would attach like any other — it is the word, not the grammar, that refuses: this is not something Karachay counts.