That's curious .... the responses re Musk's satellites! The man is a genius! He has been first to invent a reusable rocket. First to invent a rocket that will land vertically and soon, he'll be sending ships to the moon and mars and building stations on both of those worlds! He is to resupply the ISS with people and cargo and make millions in the process and is, at this time, involved with NASA in a big way. When Musk sold Paypal he made about 20 billion dollars and that is what is financing this spacex project. This man will go down in history with all the big names. If the next war ever comes china / russia or whoever will knock out the west's gps and military satellites. Fortunately we'll have Musk's umbrella of 12,000 (yes - 12,000) satellites to relay information. He might just save us all! As we speak, SpaceX is trying to miniaturize their satellites. Reason being 12,000 of them will crowd LEO (low earth orbit) AND brighten the sky to a level that will infuriate some astronomers. Ooops, sorry about that info.
