“the end of the world” – 317,000,000 search results on Google
“the beginning of the world” – 210,000,000 search results
“an end of the world” – 93 search results
“the end of a world” – 54 search results
“an end of a world” – 3 search results
“the beginning of a world” – 24 search results
“a beginning of the world” – 20 search results
“the twilight of the world” – 7 search results
“a beginning of a world” – 5 search results
“the twilight of a world” – 5 search results
“a twilight of a world” – 1 search result
“a twilight of the world” – zero search results