Isaiah 34:4 portrays stars dissolving and the sky rolling up — matching the falling stars in Mark.

Joel 2:10 has sun and moon darkened and stars withdrawing — almost identical language to Mark 13:24-25.

Matthew 24:29 is the Synoptic parallel to Mark 13:25 — nearly verbatim description of stars falling.

Luke 21:26 describes men fainting because the powers of the heavens are shaken — the same event as Mark's falling stars.

Revelation 6:12-13 explicitly shows stars falling to earth — a clear parallel to Mark's prophecy.