Riddle for 1/2/22

It can't be seen, can't be felt, can't be heard, and can't be smelt. It lies behind stars and under hills, And empty holes it fills. It comes first and follows after, Ends life, and kills laughter. What is it? 5 trphies for the first and 2 for the others

if I say it is correct then delete it fast

yes delete it now

air

nopee