Oh, and an auxiliary question: What is the point of all of these planets that I can't go to?
some are there just for show, others you can survey for materials and there's usually at least one planet per system you can land on that usually contains at least one corresponding sidequest
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http://i.imgur.com/FczF1.jpg
http://www.yourgamercards.net/trophy/a/CaptainRockman.png