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There are 1000 yoctoseconds in one zeptosecond. Therefore, a yoctosecond is oen thousandth the length of a zeptosecond.

As of 2011, yocto- is the smallest SI prefix in use.

yoctosecond means One septillionth (10 -24) of a second.

zeptosecond means One sextillionth (10 -21) of a second

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14y ago

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