Alien facts

1. A poll taken by Roper in 1991 gave a startling result. Almost 4 million people believe they have been abducted by aliens at some point in their life.

Aliens come to Earth from time to time, keeping a tracking on how humans are progressing. Here are 10 such alien races in contact with Earth.

While it is often believed that most aliens are an unfriendly bunch, there are a few species that have been on Earth for centuries who serve to disprove this claim. Some of the more friendly alien species are listed below.

01. A region near a black hole is called a photon sphere where the gravitational pull is so strong that light photons orbit it, meaning if you were at that point and turned to the side, you could see the back of your own head.

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Facts that range from odd to downright creepy.