Answer:
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
I look like a tiny trombone
I have two bodies joined together as one. When standing still I run and run.
I flow from the Homerβs mouth when he sees doughnuts.
In all the world none can compare I am a tiny weaver my deadly cloth so silky and fair.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.