Examlex
White dwarfs were once the cores of stars that produced planetary nebulae.
Miles
Miles is a unit of length, most commonly equivalent to 5,280 feet or approximately 1.609 kilometers, used primarily in the United States.
Millimeters
A metric unit of length equal to one thousandth of a meter.
Meters
A unit of length in the metric system equal to 100 centimeters, used worldwide to measure distance.
Millimeters
A unit of measurement for length that is equal to 0.001 meters.
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