Mars does not have a weight, but does have a mass of about 6.4 x 1023 kilograms, which is a little more than a tenth that of Earth. When astronauts or spacecraft orbit the Earth, we describe them as being weightless, because they are in freefall. They are not resisting gravity (the way your body does when you stand on the ground) so “Weight” becomes a totally meaningless concept when you’re in space.
Written by Allen Versfeld
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