Originally Posted by Idigmygirls

Well, let's think about this logically for a minute:

For aliens to arrive at Earth, they would need to have the technology to travel between stars, something that is far, far more advanced than our most advanced technology. Such travel would put them, at a minimum, several hundred years ahead of where we are today.

In addition, they would have to have been using this tech for generations in order to end up here on earth. After all, the likelihood that they just accidentally ended up at Earth out of all the possible destinations would be zilch. If this was their first interstellar mission, and Earth was intentional, it would have to be because they became aware of us. In that case, they would either want to contact us or study us. Contact would undoubtedly mean sending messages first. Study would undoubtedly be done from a distance first, not a "manned" mission out the gate.