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.
These muscles begin to spasm; they're trying to push the kidney stone out. This is what causes pain in your flank, back and stomach. Once the stone has come through the ureter, the pain usually abates. Anywhere from hours to weeks later, the kidney stone will pass, probably during urination. On average, stones take between one and three weeks to pass. Most stones that pass on their own will do so within a month of their first beginning to cause pain. If the stone doesn't pass within this time, it may be stuck, and could cause infection or other problems if it isn't removed.