We live in a four dimensional space time continuum meaning continuous in both directions which is expanding. Until further notice the only thing which is not expandinG is a black hole which is of course a four dimensional space time continuum which is contracting, not because I said so, but because Einstein said so. Gravity is a straight line in one of two directions, where everthing is getting larger moving at right angles, or getting smaller. Yes we make black holes here on earth its called the BOSE-EINSTEIN-Condensate nobel prize of 1997 www.geocities.com/bkparque