Englis idiom: cry for the moon

[Sangeetha]

hi,

I'm all in favour of ambition but I think when he says he'll be a millionaire by the time he's 25, he's simply crying for the moon.

Correct answer: (d) moon

Your answer was: incorrect
your sentence:
I'm all in favour of ambition but I think when he says he'll be a millionaire by the time he's 25, he's simply crying for the sun.

why not use sun??? It is still more far away.....

[Torsten]

Simply because the idiom is cry for the moon and not cry for the sun.

TOEIC listening, question-response: Do you know where the meeting will be held?