John Gill Commentary Psalms 89:11

"The heavens are thine, the earth also is thine: The world and the fulness thereof, thou hast founded them." — Psalms 89:11 (ASV)

The heavens are yours
They are made and inhabited by him, they are the work of his hands, and the seat of his majesty, and the throne of his glory; the angels of heaven are his, his creatures and servants; the several heavens are his, the airy, starry, and third heavens; the place and state of the blessed and glorified saints is of his preparing and giving:

the earth also is yours ;
the whole terraqueous globe, and all that is in it, being made, preserved, and continued by him, and by him given to the sons of men, (Psalms 116:15) ,

as for the world, and the fulness thereof :
the habitable world, and all that dwell therein, all the children of men, the beasts of the field, and cattle on a thousand hills, and the provisions for them all; which is the goodness of the Lord, the earth is full of; these are all the Lord's; see (Psalms 24:1) (33:5) (50:10-12) ,

you have founded them ;
the world, and the inhabitants of it; the earth is founded upon the seas, and the world upon nothing; and the inhabitants are wonderfully preserved and continued by the power and providence of God; see (Psalms 24:2) .