1 Eris is the most massive dwarf planet in the Solar System, exceeding Plutoâs mass by 28%. As such, it was a serious contender to be a tenth planet but failed to meet the criteria set out by the International Astronomical Union in 2006.  Eris was named after the Greek goddess of discord.
According to the American Urological Association, the time to pass stones located in ureters -- tubes leading from the kidneys to the bladder -- is an average of 8 days for stones less than 2 mm, 12 days for stones between 2 and 4 mm and 22 days for stones between 4 and 6 mm.
Kidney stones are often as small as grains of sand. They pass out of the body in urine without causing discomfort. However, the deposits can be much largerâthe size of a pea, a marble or even larger. Some of these larger stones are too big to be flushed from the kidney. Some kidney stones manage to travel into the ureter. This is the narrow tube between the kidney and bladder. The stones may become trapped in the ureter. Trapped kidney stones can cause many different symptoms.