Add to this that most terrestrial networking is done over fiber optics - the speed of light through the glass is about 2/3 the speed of light in a vacuum. If y

Add to this that most terrestrial networking is done over fiber optics - the speed of light through the glass is about 2/3 the speed of light in a vacuum. If you're transmitting radio waves into space and between satellites, you'd be as fast as most terrestrial networks so long as the transmitted arc plus twice the altitude was less than 1.5 times the same arc at ground level. As an aside, the lower speed of light through fiber optic cable is one reason many stock trading platforms use line-of-sight microwave for their primary transmission. For HFT, those uS (and even nS) matter.