Crying for the moon?

[Mahmud]

Test No. incompl/inter-43 "A Crying Shame", question 7

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 ..........

(a) stars
(b) sun
(c) earth
(d) moon

Test No. incompl/inter-43 "A Crying Shame", answer 7

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: n/a
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What does it mean?
Crying for the moon
Thanks

[Torsten]

If you are crying for the moon you are longing for what is beyond your reach.

TOEIC listening, talks: Giving information on how to register for conference

[Nabilchamlal]

what about a cry as of a sea-bird in the wind ? is it within your reach?

[Saneta]

Please explain: 'I'm all in favour of ambition '?

many thanks

[Beeesneees]

I think it's good to have an ambition in life.
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Cheers m' dears!