In this screenshot (From the Destiny E3 Gameplay Trailer) you can see a few characteristics that would apply to Mercury. First, we can see that the planet is [i]extremely[/i] bright, and also that the Sun is so close that it covers the entire visible horizon. Mercury is the closest planet to the Sun (See solar map through link below), with the second closest planet being Venus. Now, as we all know by now, Venus is a dark, lush jungle planet in Destiny, which rules out the possibility of it being the planet pictured above. All the other planets in the solar system (except Mercury) are too far away from the Sun for it to look that close from the planet's surface. That proves that the planet pictured is Mercury, and that we'll be able to play there in Destiny.
That all said, what do you think of this? What enemies do you think will be there, and why?
[url=http://www.egyptattraction.com/egypt_attraction_images/solar-system.jpg]Solar System Map[/url]