So... Destiny is a pretty sweet game, the realism of the locations are nice to have. Venus, we can see Venus from earth so that's cool, Mars, Our Moon... It all seemed right until I looked out a telescope the other day and couldn't find the 5th location: The Reef.
Yeah, pretty sure The Reef isn't an actual location in our solar system, somewhere in between the black hole near Saturn's rings and the Sol system Mass Relay.
Nice try Bungie.
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The Reef is located in the asteroid belt.