The kilogram has been measured the same way for the past 130 years, based on a cylinder constructed from a platinum-iridium alloy (proportionately 90 prevent platinum and 10 percent iridium). This ...
In early 2017, the two of us, along with a few others, refreshed the debate on the definition of planet in scientific nomenclature. The International Astronomical Union’s (IAU) historic definitional ...
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