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“This place...is it a different planet? Where are we, compared to my home?" Not that an explanation of astral geography would help much. She should have paid more attention in astronomy class.
"Yes, this is a separate world -- Alaia. Alaia and your world are... very close, in one sense."
"Meaning..."
He looked away as if organizing his thoughts. "One could say we share the same sun."
"That's impossible. We know all the planets around our sun. There's no other one that has life, or temperatures like Earth's. Besides, if our years match in length like Varene said, we'd be on the same orbit."
"In a sense, we are Earth."
"What?" She shook her head. "Start over, please."
"Perhaps you'd call it a different dimension, or an alternate plane. Our worlds share the sun but we don't exist at the same time. We are each other's shadow. While on your world, you can't see ours. And on ours, we can't see yours. Our Old Letters hint of your world, though cryptically.”