Comets wouldn't have lasted in an old universe (Talk.Origins)
- Comets lose material as they near the sun. If the solar system were very old, comets would long ago have evaporated.
- Velikovsky, Immanuel, 1955. Earth in Upheaval. New York: Pocket Books, pp. 261-262.
CreationWiki response: (Talk.Origins quotes in blue)
1. The comets that entered the inner solar system a very long time ago indeed have evaporated. However, new comets enter the inner solar system from time to time. The Oort Cloud and Kuiper Belt hold many comets deep in space, beyond the orbit of Neptune, where they do not evaporate. Occasionally, gravitational perturbations from other comets bump one of them into a highly elliptical orbit, which causes it to near the sun.
This is not based on observation, but is actually two theories invented to save the old age model from reality. There is absolutely no observational evidence for the so-called Oort cloud, and so-called Kuiper belt objects are too big to be comets and many clearly have a different composition from comets.
Reference: More problems for the "Oort comet cloud"
Reference: Comets and the age of the solar system
Reference: Halley's comet—beacon of creation