Riddle Time

I am kind of on a riddle kick right now so I think I will do a weekly riddle for people to figure out to kind of spice up my otherwise boring blog where I just talk about my life. Never fear for those that want to read my weekly recaps, they will still be here. :)

And now the riddle....

It cannot be seen, cannot be felt, 

Cannot be heard, cannot be smelt. 

It lies behind stars and under hills, 

And empty holes it fills. 

It comes first and follows after,  

Ends life, kills laughter

Send me an email on facebook with your answer. If I get enough responses I may give a prize. :)