I say: O my God, take me not away in the midst of my days, Thou whose years endure throughout all generations.
Of old Thou didst lay the foundation of the earth; and the heavens are the work of Thy hands.
They shall perish, but Thou shalt endure; yea, all of them shall wax old like a garment; as a vesture shalt Thou change them, and they shall pass away;

Three sources have recently drawn my attention to the likely state of our world in 100 billion years’ time.