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.
Whether a stone will pass on its own depends on its size. 1  Stones smaller than 4 mm: The good news is that about 80% of stones this size will pass on their own. The bad news is that passing a stone takes time -- an average of 31 days.  Stones 4 mm or larger: The chances of passing a stone this size are lower.