The ones who look

Looking and looking, Boom! I got an asteroide entering the earth,
“Jhonny you saw that?”
“Yes”
I can´t figure out how these people that work in NASA can track every day,
or most days, these things and then go to sleep. Quite the people this ones,
I have been literally sweating because I don´t have a dime to my name,
so who are these guys?
Just keeping things in prespective but in a weird way.