Eschatology is the theology of the end of things. In the three great monotheistic religions, Judaism, Christianity and Islam, eschatology means the "end of the present age" or the end of the present order of things. That is to say, the future time when God's plan for the universe is finally brought to final fulfillment.
Some eschatologies hold that the present order is wiped away entirely and a completely new order is put in place. Others hold that the present order is redeemed and transformed into the new order.
In either case, modern astrophysics poses a challenge because it holds that the universe has perhaps 100 billion years or more to go before it runs out of steam. So we need not look skyward for the hand of God swooping down anytime soon.
And so this: Allan R. Bevere: Science and the Eschatological Challenge to Theology (Part 1)