She hadn't thought much about it, her planet. To her it was the only thing she knew, and then it was just a tiny part of it. To the Doctor, and now to Rose, it was this tiny planet in one solar system in one galaxy that was only one tiny part of a greater universe than she had ever comprehended before. So tiny.
She both loved and hated the Doctor for coming into their lives and showing them this.
Now she wished she understood better.
How was she supposed to adjust to a parallel Earth?
Everything was so different.