i always wanted to know this.<br />the mars rovers took 7 months to arrive on mars. ok first question how did they guide them to get there? isnt mars 36 million miles away? what propulsion could get them to get that far? <br />secondly now that they are there how do they remote control these rovers to tell them to do what they want them to do with such specific commands at 36 million miles away? we can't even get good cell phone reception from distances of only miles away.<br />how is it possible? what technology do they use to do it?<br />if anyone knows please let me know.<br />thanks.