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TonyLondon
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If a singularity slows time. How long was the first second after big bang?
No, it is not. It looks different to a remote observer but that's a different story.TonyLondon said:A second by my watch is different from a second next to a singularity.
Yes, It would have been the time it took light to travel 186000 miles along a spacetime geodesic, assuming there was nothing to get in its way.Are you saying it would be the time it took light (if it had existed) to travel 186000 miles (in which case it would have been a really long second)? Just trying to get this concept right in my head before I launch into more study.
TonyLondon said:A second by my watch is different from a second next to a singularity.
The length of a second is determined by the International System of Units (SI). It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium 133 atom.
No, the length of a second has not always been the same. It was originally defined based on the length of a day, which was thought to be constant. However, with advancements in technology and more precise measurements, it was found that the rotation of the Earth is actually slowing down. In 1967, the second was redefined based on the properties of the cesium atom.
The length of the first second is difficult to determine as it was not measured with the same precision as it is today. However, based on calculations and estimations, it is believed that the first second was approximately 1/86,400 of a solar day, which is the length of the first day on Earth.
Yes, time can be measured in smaller units than a second. The SI system also includes the millisecond (1/1000 of a second) and the microsecond (1/1,000,000 of a second). Technology has also allowed for the measurement of even smaller units, such as nanoseconds (1/1,000,000,000 of a second) and picoseconds (1/1,000,000,000,000 of a second).
It is possible that the length of a second may change in the future as technology and measurements become more precise. However, any changes would likely be very small and would not have a significant impact on our daily lives. The SI system is constantly being reviewed and updated to ensure that the units are as accurate as possible.