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.
Most kidney stones that pass on their own do so by 40 days. Medications called antispasmodics may be prescribed to help a stone pass. They relax the ureters, which can increase the likelihood of passing a stone and speed up passage by 5 to 7 days, according to an article in the December 2011 issue of the âAmerican Family Physician.â