'Worlds' in the Bible

has in these last days spoken [with finality] to us in [the person of One who is by His character and nature] His Son [namely Jesus], whom He appointed heir and lawful owner of all things, through whom also He created the universe [that is, the universe as a space-time-matter continuum].

By faith [that is, with an inherent trust and enduring confidence in the power, wisdom and goodness of God] we understand that the worlds (universe, ages) were framed and created [formed, put in order, and equipped for their intended purpose] by the word of God, so that what is seen was not made out of things which are visible.