Answer:
Forward I am heavy backward I am not. What am I?
I start new then become old. Start clean but become dirty. I usually start big then become little. What am I?
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
I am a type of weapon for SCI-FI characters
Alone I am 24th with a friend I am 20. Another friend and I am unclean.
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?