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Is there Life on Mars? A question humanity has asked for centuries. Then maybe one of those many people who have looked into this has found the answer? Sadly, not yet. It has been established that life on Mars could be possible, but we still don’t know if there really is or if there ever was. At least NASA found evidence that water did once exist on Mars—we might be a small step closer to the truth.

And why just look to Mars when we have an entire, vast universe to discover? We’re human, we’re curious and many believe we can’t possibly be the only ones around here. But while there are countless reported UFO sightings and people claiming to have been abducted by extra-terrestrials, there is no evidence of alien visitors on Earth.

Enrico Fermi, an Italian physicist known for the first controlled, self-sustaining nuclear reaction amongst other things, claimed that any civilization advanced enough to have interstellar travel would have populated its entire galaxy in a brief period of time. But if it’s right, where are they? 

Of course, scientists have tried to find a plausible explanation. Maybe interstellar travel is impossible after all and there is no way to boldly go where no one has gone before

Or maybe it’s something a little bit ‘closer to home’: Global warming and climate change. It may be that advanced civilizations always self-destruct by overheating their planets. Alternately, the climate change may be brought on by astrophysics. This theory argues that that the only reason complex life could evolve on Earth is the unique combination of geological and biological cooling that offset the Sun’s natural temperature rise as it aged. Life forms on a seemingly habitable watery planet without the same blend wouldn’t be as lucky.

The next theory leaves us in somewhat of a worse light: Researchers of the Harvard-Smithsonian Centre for Astrophysics (CfA) have conducted a research claiming that it may be possible to find alien life by searching for their industrial pollution. If there’s pollution, there’s intelligent life—at least that is what we think. But Henry Lin, the lead author of this research said the following: “Perhaps civilizations more advanced than us will consider pollution as a sign of unintelligent life, since it’s not smart to contaminate your own air”. Well. In that case, is it safe to say those advanced civilizations wouldn’t have any good reason to come visit us, then? 

While there are many theories to try to explain why, the only thing we know for sure is there is no evidence that aliens exist, much less that they’ve visited. That doesn’t keep people from claiming to have seen them, though. If you want to know the best explanations for some of the weirdest cases of UFO sightings, be sure to tune in to Invasion Earth, premiering in October!