Eris' size resulted in its discoverers and NASA labelling it the solar system's tenth planet. This, along with the prospect of other similarly sized objects being discovered in the future, stimulated the International Astronomical Union (IAU) to define the term planet more precisely. Under a new definition approved on August 24, 2006, Eris was designated a dwarf planet along with Pluto and Ceres.
Best Answer: it depends on a few things~...but the longest time a human can stay upside down is 2 days.. If your heart is reasonably healthy and you aren't restricted, then you shouldn't pass out at all, any more than you would laying down or standing up.
Quickly lie down onto your right side and turn your head 45 degrees to the left (toward the ceiling). Hold this position for 30 seconds or until any dizziness passes. Return to the upright position looking straight ahead for 30 seconds. Perform same maneuver to the left side, with head rotated toward the right.