en_tn_condensed/mrk/13/25.md

the stars will fall from the sky

This does not mean that they will fall to earth but that they will fall from where the are now. Alternate translation: "the stars will fall from their places in the sky" (See: rc://en/ta/man/translate/figs-explicit)

the powers that are in the heavens will be shaken

This can be stated in active form. Alternate translation: "the powers in the heavens will shake" or "God will shake the powers that are in the heavens" (See: rc://en/ta/man/translate/figs-activepassive)

the powers that are in the heavens

"the powerful things in the heavens." These words could refer to 1) the sun, moon, and stars or 2) powerful spiritual beings

in the heavens

"in the sky"