The rocks found in northern Québec, Canada, could even date back to 4.2 billion years, questioning the existence of life on Earth.
The cloud in Alaska sparked some wild theories, but - as ever - the truth is less exciting
After developing a 'relationship' with the aliens, she quit her job as a nutritionist to pursue astrophotography full-time
The man who filmed it said the mysterious shape was visible for almost two hours
A 68-year-old man claimed that he was abducted by aliens when he was a teenager
Scott Waring is always on the lookout for unusual goings-on in space, and he reckons he's found categoric proof of life on Mars
Russ Kellett has had numerous encounters with UFOs over the past 50 years