Landing on the moon, walking on the sun

from XV – When We're Done Lyrics on Rap Genius

Meaning

XV always mentions how he is from another world, Squaria.

Squaria is the hip hop world that XV is the hero of.
This line refers to how he wants to accomplish great things like landing on the moon.

Walking on the sun on the other hand would be even greater accomplishment (If you wouldn’t die in the process)

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