Weird Science

A big part of writing science fiction is having a good grasp on science.
Maybe, when writing “Son of M” #2, David Hine knew something I don’t.
And maybe the moon works differently in the Marvel Universe.
But as Quicksilver and Videmus stand in The Blue City on the moon, looking Earthward, can someone explain to me what Videmus meant when he said “The Earth is rising” ?
Yeah I’m being a smartypants, but stuff like that just jerks me right out of the story.