This is a leading question that anticipates the answer, Yahweh. Alternate translation: "Yahweh has created all these stars!" (See: [[rc://en/ta/man/jit/figs-rquestion]])
Here the word "formations" refers to military formations. The prophet speaks of the stars as if they were soldiers whom Yahweh commands to appear. (See: [[rc://en/ta/man/jit/figs-metaphor]])
The phrases "the greatness of his might" and "the strength of his power" form a doublet that emphasizes Yahweh's power. Alternate translation: "By his great might and powerful strength" (See: [[rc://en/ta/man/jit/figs-doublet]])