The Bible says “The earth abideth forever” (`Ecc. 1:4`). How do we harmonize this with the conclusions reached by scientists that the solar system is gradually running down and that eventually the earth will become cold and lifeless?

Even if the conclusions of scientists were realized as suggested above, it would not be out of harmony with the Bible statement, for the earth would still be "abiding" although in a lifeless form. Various have been the speculations as to the ultimate fate of the earth. Some have conjectured that the earth would eventually drop into the sun and thus be consumed. Others have suggested that a collision would occur with some comet or with another planet, and in this way, the earth would be disposed of. The suppositions of scientists have served to amuse a not too credulous public and, we believe, not many have taken them seriously as to their wild guesses. How reasonable and consistent the Bible teaching to the effect that the Creator formed the earth to be inhabited, and that while it is still in an imperfect condition as a habitation for mankind, yet it is to be made glorious and perfect and in its beautified state will form an everlasting dwelling place for the regenerated human race! See `Isa. 14:18`.