Galaxies wind themselves up too fast. The stars of our own galaxy, the Milky Way, rotate about the galactic center with different speeds, the inner ones rotating faster than the outer ones. The observed rotation speeds are so fast that if our galaxy were more than a few hundred million years old, it would be a featureless disc of stars instead of its present spiral shape. Yet our galaxy is supposed to be at least 10 billion years old. They have devised many theories to try to explain it, each one failing after a brief period of popularity.
Comets disintegrate too quickly.
According to evolutionary theory, comets are supposed to be the same age as the solar system, about 5 billion years. Yet each time a comet orbits close to the sun, it loses so much of its material that it could not survive much longer than about 100,000 years. Many comets have typical ages of 10,000 years. So far, none of these assumptions has been substantiated either by observations or realistic calculations. Even if some bodies of ice exist in that location, they would not really solve the evolutionists' problem, since according to evolutionary theory the Kuiper Belt would quickly become exhausted if there were no Oort cloud to supply it.