Zepto-Moon

I have a thing for crazy units. The first crazy unit I found was the femto-lightfortnight. You may be familiar with the lightyear which is how far light travels (at 186,000 miles per second) in a year. A femto-lightfortnight is the distance that light travels in a quadrillionth (10-15) of a fortnight. If you work out the maths, it turns out to be a length of about 36 cm (just over 14 inches). Quite useful for measuring the heights of people. My latest crazy unit is the zepto-Moon, or in other words, a sextillionth (10-21) of the mass of the Moon. The Moon has a mass of 7.36 1022 kg, so a zepto-Moon works out at a handy 73.6 kg (162 lbs for those still using old money) which just happens to be about the same mass as me. Utterly pointless.

Posted in astro blog by Stuart on Wednesday 04th May 2005 (00:42 UTC) | Permalink
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