No.
'World' is a common noun.
It should only be capitalized in the beginning of a sentence, in a title of a book or other piece of literature, or if it is in a company's or person's name.
It is a resounding no on this one because all planets are known WORLDs, so this would not make it a concrete noun therefore excluding it from the grammar given rule of the capital letter.
On the other hand Earth would always receive a capital as it is a concrete noun because there is only one Earth, it's the name that was given to it like Mars, Pluto, Sun etc..
Efl Teacher.
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7 wonders in a world
World is another name for earth. It satarts with a W.
7 wonders of the world dummy's
No African country starts with W. Wales is in Europe and is the only country in the world that starts with W.
world