If matter distortions the spacetime structure and this structure keeps, let´s say, matter in orbit, i can´t think of this structure as inmaterial. How space time hold matter in orbit? by contact??? Hasn´t something to be made of matter to curv? I understand ¨structure¨ of spacetime as matter??? HEEEELLLLPPP!!! Is spacetime something we can´t experience? Sorry about the english, i´m from argentina.