The mass of an object is how heavy it is. The amount of matter in an object is its mass. You can use the words 'heavy' and 'light' to describe the mass of an object. You can use the words 'heavier' ...
IFLScience on MSN
Interstellar Object 3I/ATLAS Has Slightly Changed Course And May Have Lost A Lot Of Mass, NASA Observations Show
Whilst the interstellar visitor was out of view, it appears to have changed course slightly, brightened, and may have lost ...
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