What do they mean by the Last Day-I hear this all the time & as a science person-to me that means when the sun ends its life. That means billions of years to go. So does it mean that all that rest in the grave are essentially lifeless pieces of mass. When is this resurrection? Why do then ministers often say that oh the loved one is in a better place now. I mean what is the status of people like the Apostles, Isaiah, Moses, Joshua, Nehemiah, Isaac, King David, Esther...
In the Nicene Creed we confess, "He [Jesus] will come again with glory to judge the living and the dead. His kingdom will never end." It is the Christian hope that Jesus, who died and rose on the third day, and who ascended into heaven and sits at the right hand of the Father will come again. The day of His return (Greek: Parousia) is the Last Day, because His return is the consummation and the conclusion of history. When Christ returns He comes as judge of the living and the dead, to raise the dead, and to make all things new. That last statement, "to make all things new" refers to the hope mentioned in places like Isaiah where the Prophet says God will make a "new heavens and a new earth" which is echoed again in the Apocalypse of St. John, "And I saw a new heavens and a new earth ... And the one who was seated on the throne said, 'See, I am making all things new!'" (Revelation 21:1, 5)
Because Christians believe in the renewal of creation, the restoration of creation, St. Paul in Romans 8 says that at present "creation groans" looking forward to the "appearance of the sons of God" by which he means the future resurrection of the dead at Christ's coming, "For He who raised Christ from the dead will also give life to your mortal bodies".
This is what the Gospel is about, it's the meaning of Christ's death and resurrection. Jesus died, conquering death by death, for the sins of the world; and in rising has triumphed over death, hell, and the devil. In Him God is renewing and restoring creation, and we in Christ having our sins forgiven, union with Christ, and the hope of the future world when God restores all things; which includes the resurrection of our bodies.
So that is what "Last Day" means. The day when Christ returns, bringing conclusion to history, and bringing wholeness and newness to the whole created order.
From a Christian perspective entropy is a fundamental wrong in the universe--death is an injustice which God is healing in Jesus. If left to its current course the sun will in about five billion years expand, consuming the earth, and--given current cosmological models that I am familiar with--the universe will eventually in trillions upon trillions of years die a slow heat death. That fate, would say a Christian, will not be because God is saving His creation. We look forward, therefore, to Christ's return when all will be made new, at the conclusion of history. When this will be, we don't know. Tomorrow maybe, or maybe ten thousand years after tomorrow; but we believe and hope and trust in His return, His glorious Parousia, on the Last Day.
-CryptoLutheran