However, laying that aside, along with all the other problems that are hard to fathom like quantum mechanics (there could be multi universes existing at the same time according the great physicist Brian Cox), a recent UFO sighting in England has raised the old debate again as to their reality.
A Met Office representative said: "After looking at the images, I can say the object is nothing to do with the weather. It is not meteorological and is not a cloud."
A senior lecturer in the institute of cosmology and gravitation at The University of Portsmouth, added: 'Given the pictures show a dark object against a daytime sky, it's clearly not an astronomical object. Many UFO sightings are the planet Venus, but this one can't be that. The distances in space are so vast that it's just not possible for aliens to be visiting Earth, so any interpretation suggesting this is an alien spacecraft is clearly wrong."
Well, that gives us the experts' opinion. What do you think about the possibility of UFO's?