Star Trek has Vulcan, Supernatural has Lilith, and Marvel has Counter-Earth. But guess what? So do we! Well, we almost did...
Not much on this planet or in this universe drums up as many conspiracy theories as space does, unless you count the government. The moon landing is thought to be a hoax, and UFOs really do come down and take you away to do bad, bad experiments on you. Let's not forget the rat and the face on Mars! But this isn't a recent thing, our fascination with outer space and all the mysteries she holds, not by a long shot. For as long as mankind has been able to look up and see the stars, we've always questioned things, and hypothesized about it. And when those theories get shot down, we come with 3 more. Throughout history, there are have been plenty of theories about rogue planets, Earth having a second moon, and even talk of a planet that gave birth to the name of a planet that gets Trekkies' panties in a bunch.
10. Lilith, Earth's Second Moon
In 1846, a man named Frederic Petit claimed to have found our planet's second moon. It was an idea that would have died pretty quickly, had the one and only Jules Verne not heard about it, and used the idea in his novel From the Earth to the Moon. The ensuing frenzy led other astronomers to look for the second moon, or a satellite of our moon. In 1918, the British astrologer Sepharial kept the party going by claiming a second moon, which he named Lilith, was invisible to the naked eye most of the time, and could only be soon when it crossed in front of the sun. His idea was debunked, but it was so popular that horoscopes today still reference “the dark moon” Lilith.
9. The Original Vulcan
This theory didn't live long and prosper, but the name Vulcan did. In the 19th century, deviations in Mercury's orbit puzzled astronomers, who decided that one possibly explanation could be another planet inside Mercury's orbit. Like with Lilith, the only way to see this supposed planet was when it crossed between Earth and the sun, or during solar eclipses, and numerous times, suspicious “dots” would be seen, and they would stir up even more interest in this phantom planet. In 1860, there was going to be a total eclipse of the heart...I mean sun, so astronomers around the world tried to find Vulcan, the name given the planet by an astronomer named Le Verrier. They all failed in spotting it, and it was never seen again. The idea of Vulcan has pretty much been brushed off ass asteroids passing between the Earth and the sun.
Comic book and movie fans alike get pretty excited when they hear about a second Earth. The Flash and his friends, however, probably aren't too thrilled about the idea. The theory goes likes this; there is another Earth in pretty much the exact same orbit around the sun as our planet, only Earth 2 is on the exact opposite side of the sun, all the time. It's a theory that's never really caught on anytime in history, simply because the slight changes in our orbit surely would make it so we could at least catch a glimpse of our twin on the other side of the sun. Unless, the inhabitants of that Earth have a really big cloaking device...
Long story short, the Church of Scientology founder, L. Ron Hubbard, claims an interplanetary nation, Helatrobus, existed trillions of years go. Looking into these Helatrobans, something about “implants,” and radioactive clouds surrounding planets just confuses anyone who goes anywhere near it, so we'll just live this one here and move on.
In 2006, much to the chagrin of pretty much everyone who has learned the names of the planets in school over the past 100 years, Pluto got demoted from being a planet to being a dward planet. Since then, other planets have been discovered beyond Pluto, but have been too small to be officially classified as planets. Persephone, the wife of Pluto in greek mythology, was one name suggested to be used as one of those planets, but until astrologists revise the criteria a big rock has to meet in order to become an official planet, Persephone won't ever exist.
This is where this all gets really good, if you're into government coverups, secret aliens, and Area 51. The (fairly insane) theory goes like this; an alien that survived the Area 51 UFO incident, and was detained by the government. He was treated well, and after a while, contacted his planet and returned there, to Serpo. This led to a treaty of sorts between our government and the aliens on that planet. So many stories exist about the planet Serpo, but it's said the planet is in the star system Zeta Reticuli, and has been visited by 12 US soldiers. Because of the radiation being much higher on Serpo (because of the smaller planet and two suns), 8 of the soldiers who returned home have died, 2 died on Serpo, and apparently the other 2 are still alive and chilling with the Serpo...ites?
In Spain, in the 1960s and 70s (specifically February 6, 1966, according to historian Mike Dash, in Mardrid), Ummoism began. Like all crazy UFO stuff, this one started with a close encounter of the first kind, and the man to supposedly start it all was Jose Luis Jordan Pena. Soon after his abduction, letters and photos started being sent to an author of a UFO book in Madrid, and another Spanish man, Fernando Sesma, coming from a race who called themselves the Ummites. In their letters, they wrote of many things that the human race faces and discusses; God, sex, philosphy, education, and marriage, to name a few. In 1965, the Ummites wrote that their planet orbits Wolf 424, an actual binary star system approximately 14 light years away from our sun. Unfortunately, and obviously, no real proof has been give of the Ummites existence, but we can dream, can't we?
Phaeton was a planet believed to existed between the orbits of Mars and Jupiter. It's destruction resulted in the asteroid belt being formed. Ceres, the largest of the asteroids in the belt, is now considered a dward planet, was discovered in 1801, and was believed to be Phaeton. This hypothetical fifth planet, as it would be referred to, was a victim of William Olbers' planetary disruption theory, which claims there was once a huge member of our planet club between Mars and Jupiter a long, long time ago in a galaxy that was milky. It was destroyed by what could have been any number of things, like Jupiter pulling it apart with its gravity, or being struck by another planet or asteroid.
This planet is part of the theory that our moon was formed when a planet, Theia, collided with our Earth, and the moon formed from the debris left over. This theory suggests that the moon would be made up of both Earth and a mystery planet's rock. Since most every planet in our solar system has a unique chemical makeup, and tests on moon rocks suggest that the moon's chemical makeup is very similar to Earths, means this Theia theory is most like just that; a theory.
1. Tiamat & Nibiru
The theory of Tiamat is similar to Phaeton's, in that it's believed (to this day, even) that Tiamat was once where the asteroid belt is now. Nibiru is the more famous of the two, being in the news not too many years ago, and being referred to as Planet X or the tenth planet. Nibiru is supposed to be following this huge elliptical orbit around the sun, reaching the inner solar system (that's us) every 3,600 years. It was “supposed” to arrive again on September 24, 2015, and either destroy us all or worse, but of course, it never appeared. Zecharia Sitchin wrote that, a long time ago, one of Marduk's moons, Nibiru, struck Tiamat and broke it in half. A second pass with the same moon hit Tiamat again, this time hitting one of the halves, smashing it in to pieces, and forming the asteroid belt. The second remaining half of Tiamat was struck by another moon, and was pushed into a new orbit, forming our little third rock from the sun. It happened just a few years ago, according to Sitchin, around 4.5 billion years. Obviously, in the months leading up to September 24, 2015, there were websites upon websites popping up, exclaiming how this was the end of days, and if we didn't believe it, to just look at the crop circles. It was supposed to swing by on May 27, 2003, according to an abductee named Nancy Lieder. She was so sure it was happening then, that she euthanized her dogs. To add insult to her dog's injuries, the date came and went without so much as a mushroom cloud.