New Defender's Study Bible Notes
102:26 wax old like a garment. The aging of the earth and heaven is a relatively recent discovery of science, which is the universal principle of increasing entropy or decay. This remarkable fact—that every system of any sort or size tends to disintegrate with time—is now recognized as the Second Law of Thermodynamics, and has no known exception. It reflects God’s primeval Curse on the creation because of sin (Genesis 3:15-17; Romans 8:20-22).
102:27 thou art the same. There is, of course, one exception to this law of decay. The God who imposed the law on His creation is not subject to the law Himself. Neither is His Word, for Jesus said: “Heaven and earth shall pass away, but my words shall not pass away” (Matthew 24:35).