You also don't know what the mass of the dome would be either. Since the dome must be attached to the earth and an airtight seal in place at the edge, I would consider it part of the 'earth' as well. I haven't ever seen any hypothetical 'specifications' for the size of the dome or it's composition. Some say it's just energy, some say it's like molten glass, and some say it's plasma. I would propose a DOMER expedition to the 'edge' so careful samples can be taken and a scientific study undertaken. With all the toxic pollution that's being generated on the earth I would hate to see that damage the dome in anyway. With the dome damaged a lot of bad things could happen to us earthlings. There's just no place like DOME.