"reached" vs "colonized". We ourselves reached the moon and will soon reach Mars, but we have no intention of leaving more than a couple of buildings in Antarct

"reached" vs "colonized". We ourselves reached the moon and will soon reach Mars, but we have no intention of leaving more than a couple of buildings in Antarctica, or deep in the oceans. So yeah, it's certainly possible they've sent a couple of dinosaurs on Mars, but didn't leave a lot of concrete buildings anywhere else.