IN central ohio there was a write up in the paper in the 50's about a UFO that went over a ballfield when a little league team was playing. My grampa was part of that team and out on the field when it went over. 
He's dead now but he was CERTAIN that aliens were among us.
I dont know that theyre aliens, I think the paranormal is probably more the supernatural. 
And our military. 
And for the record, I've seen a green light like that before- in the sky (we have northern lights up here in the north east, I know what they look like- this was summer time, and it was NOT a pretty little ripple in the sky) beside the moon.
UP here where we are there is a light in the sky regularly during the summer months and rarely in winter. It flies in the same pattern over and over and over, so slowly it cant possibly be an airplane, and I cant imagine who owns a helicopter and is spending all those hours flying in a triangle.... i imagine it can be explained, but it is awful strange. edit: at night. Its always at night.