Allah certainly holds together the skies and the earth lest they get separated and if they get separated, no one other than Him can hold both of them together. He is certainly Clement, Protectively Forgiving.
The expanding universe is trying to throw the heavenly bodies away while their mutual gravitational force is offering equal resistance, tending to collapse the universe. The critical balance between these two forces is maintained by Allah (SWT) Who can any time disturb it and end the universe.