“But in those days, following that distress,
“‘the sun will be darkened,
and the moon will not give its light;
the stars will fall from the sky,
and the heavenly bodies will be shaken.’ (Mark 13:24-25)
Compare this with a prophecy of Isaiah about the destruction of Babylon
The stars of heaven and their constellations
will not show their light.
The rising sun will be darkened
and the moon will not give its light. (Isaiah 13:10)
Isaiah's prophecy came true, Babylon was destroyed but the stars did not stop showing their light - the language used was poetic intending to highlight the seriousness and permanence of the judgment. The same was true of Jesus' prophecy about Jerusalem and the temple in Mark 13. The stars didn't actually fall but in 70AD, within a generation of Jesus' prophecy, the temple and Jerusalem were destroyed.