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so even if we make this night.. we can assume that the man is on mercury or venus where the days are shorter.. :D

Not really! While a year (defined as a period of rotation of the planet around the Sun) on Mercury and Venus is shorter than Earth's year, a day (defined as the period of rotation of the planet around its own axis) is much longer on those planets. A day on Mercury is equal to 176 Earth days, while on Venus a day is equal to 243 Earth days. An interesting fact that on these 2 planets a single day lasts longer than a year!

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Gosh that is some info! Thanks for sharing! :)

Is there any planet where days are shorter than earth days ?

The shortest day of all planets in the solar system is on Jupiter and is just short of 10 hours. Uranus, Saturn and Neptune all have days shorter than 24 hours. Neptune is the only planet that is not a solid object and different parts of the planet are rotating with different speeds causing the length of the day to vary depending on your location on the planet. Cool, isn't it?

EDIT: spelling

Edited by k-man
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