Red Dwarf aka Nabiri will be impossible to see because it does not reflect any light. Its a cold, dead planet and the only way we can see is by feeling the destruction from gravitational pull. Aka... We can only discover it when poo hits the fan. I believe Nabiru exists and it passes through our solar system every 26,000 or so years.
Ok, for Nibiru to take 26,000 years to orbit the sun, using Kepler's third law & assuming that the body would pass through the solar system, that works out to about 3200 astronomical units (AU being the distance from the sun to earth) at the far point of it's orbit. Now Pluto is about 39 AU out. Anything with the mass to seriously fug with other planets is going to escape after it's first trip around the sun. Also, pretty sure you mean brown dwarf because a red dwarf would still be brighter than Jupiter at about 500 AU.
If you read greek and sumarian mythology then u know both cultures talked about 12 planets in our solar system but we only see 11 (including pluto) and 1 is still missing. What happened to the 12th planet? Also, number of asteroid flying toward earth increased almost 10 fold in last few years... Why? What takes these asteroids from outer space and shoots them toward earth at incredible speed?
...Forget 12 what is 10 & 11?