The head of the astronomy department at Harvard University revealed that aliens have been to the earth. Is there really an alien civilization? Long, head of the astronomy department at Harvard University, said that aliens have been here. The earth really has an alien name, and it is still a name. We sometimes find traces of aliens coming to the earth, but there is no way to determine whether there is an alien civilization, so it is still impossible to determine whether there is an alien civilization, whether there is life, and whether it exists in other planets.

We can't prove whether there is an alien civilization, and we have no way to prove it, so until now we have no way to prove whether there is an alien civilization, so it is still a mystery, and we have no way to prove it, so we still don't know or are not sure whether there is an alien civilization. If there are traces of alien civilization on the earth, it proves that aliens have been to the earth, but have they died. Or whether the earth they left has returned to their hometown, we are not sure, so we have no way to prove whether there is an alien civilization in other planets, so we are not sure whether there is an alien civilization.

It needs to be proved that although there are traces of alien civilization coming to the earth in the well of the head of astronomy department, this is only a trace, and it cannot really prove the existence of alien civilization, or that aliens have been to the earth. These may not be traces left by alien civilization. These are normal things, but they may be traces left by other animals. These are uncertain events. It is not until one day that we really see the creatures of alien civilization that we can prove the existence of alien civilization.

Generally speaking, if you want to prove the existence of alien civilization, you must have favorable evidence. At this time, you can prove the existence of alien civilization. It is impossible to determine the existence of alien civilization through these traces, because these traces may be traces left by other animals or other creatures. This is not necessarily the trace left by alien civilization. We can't be sure about this. We must have favorable evidence to prove the existence of alien civilization. In other words, anyone who has seen an alien civilization or taken photos can prove the existence of an alien civilization. Only through these traces can we roughly predict the existence of this creature, but we can't prove the existence of alien civilization. This kind of thing needs strong evidence to prove the existence of alien civilization.