Astronomers at Caltech have announced that evidence for an undiscovered ninth planet in the Solar System is mounting. It would be larger than the Earth, but smaller than Neptune. It could be a Super-Earth or a Mini-Neptune. But it’s orbiting so far away, it would take 20,000 years for it to orbit the Sun. It’s ten times the distance from the Sun as Neptune.
So, why do they think there’s another planet out there? All of the larger bodies, such as Sedna, that are orbiting beyond Pluto seem to all stay together on one side of the Solar System. This is strange, because it is far more likely that they’d be more evenly spread around the Solar System. The most likely explanation is a large planet orbiting at an even larger distance with its aphelion at the opposite side of the Solar System as these other large objects. Watch this video for an explanation by the two astronomers who have been studying this.
This is actually a very serious study going on, and it’s being reported by many reputable science and news agencies. If this planet is real, they have a rough estimate of its location, so they can search for it. But with its great distance, it’s not quite like searching for a needle in a haystack, it’s more like searching for a grain of sand in a farmer’s field.
Personally, I’m hoping something is found. This would be a very exciting discovery. What do you think? Are they on to something? Let me know in the comments below.