Unknown. If you used “ounces” as weight. For instance, if Neutron Star core material is measured, then about 20,000,000,000,000,000 ounces in a cup
In the US Liquid Volume system, 8 fluid ounces = 1 cup. 8 floz = 1 cup
In the US Dry Volume system 8 dry ounces = 1 cup
