Comets are occasionally observable in Space using the unaided human eye. There are a large number of comets travelling through Space. Comets become observable to the human eye only when they are comparatively close to the Earth.
They are technically referred to as “short period comets”. As comets travel through space, they intermittently loose parts of their material, as the combined effects of the solar wind and the Sun burns pieces of material off them. Comets continue to loose material. The pieces of material are burned up as they leave the comets, explaining the big long bright tail behind them. Comets have a total life expectancy of less than 10,000 years, because they burn out.
Evolutionist need to explain to Creationists why, if the Universe is millions of years old, comets still observed in Space at all, in view of their short life of only 10,000 years. There is no indication at all that new comets are being created.
A similar argument can be applied to asteroids and space dust. The existence of comets, asteroids, and space dust indicates a young Universe, less than 10,000 years old.