Here's what may have created the strange glowing objects in the skies above Sydney.
It's only human to see faces and lifelike shapes in images, as the "face on Mars" and other examples attest.
The movie Cowboys and Aliens features UFOs zipping around the Wild West, which may (or may not) have actually happened.
In late January, several YouTube users uploaded videos that showed a UFO hovering over Jerusalem. But it's all a hoax.
A team of psychics claims to have found evidence not only of life on Mars, but a large industrial dome and a plume of waste coming from it.
A mysterious NASA image from Mars is a rock, not a human figure of some sort as many internet sites are suggesting.