Find the center and radius of the sphere. 
Definitions:
Gram
A metric unit of mass equal to one thousandth of a kilogram.
Millimeter
A metric unit of length equal to one thousandth of a meter.
Microgram
A unit of mass equal to one millionth of a gram, often used to measure very small quantities of medication.
Liter
A unit of volume equal to 1,000 milliliters or approximately 33.814 U.S. fluid ounces.
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