Kanned Ham and other creationists insist that the subject of deep time is not based on "observational science". This article describes how direct observations in the here and now show that the speed of light has not changed significantly over vast stretches of time and that the idea of a young earth and a young universe is false. SN1987A and the Age of the Universe
"When the smoke blown about finally drifts away and the debate hall falls silent, the young-earth creationists find themselves back on square one. He is looking at stars many millions of light-years away, stars putting out light which takes many millions of years to reach us! Attempts to speed up the velocity of light or to shrink down the universe have come to naught. What does remain is the old age of our universe."
"When the smoke blown about finally drifts away and the debate hall falls silent, the young-earth creationists find themselves back on square one. He is looking at stars many millions of light-years away, stars putting out light which takes many millions of years to reach us! Attempts to speed up the velocity of light or to shrink down the universe have come to naught. What does remain is the old age of our universe."