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2) Apollo 16: Describing Domes and Tunnels on the Moon:
Duke: We felt it under our feet. It's a soft spot. Firmer. Where we stand, I tell you one thing. If this place had air, it'd sure be beautiful. It's beautiful with or without air. The scenery up on top of Stone Mountain, you'd have to be there to see this to believe it - those domes are incredible!
Mission Control: O.K., could you take a look at that smokey area there and see what you can see on the face?
Duke: Beyond the domes, the structure goes almost into the ravine that I described and one goes to the top. In the northeast wall of the ravine you can't see the delineation. To the northeast there are tunnels, to the north they are dipping east to about 30 degrees.
Lunar domes are gentle swells between 3 and 20 km across, and at most a few hundred meters in height.