Table of Contents
How many Planck times old is the universe?
| Planck Time Doublings: (Seconds) | |
|---|---|
| The Age of the Universe: Estimates: 13.78 to 14.1 billion years It appears that we currently live in the earliest part of 202 doubling. | |
| 203 | 6.9309178×1017 seconds (21.9777+ billion years) |
| 202 | 346,545,888,147,200,000 seconds (10.9888+ billion years) |
Is there anything smaller than Planck time?
There is no currently available physical theory to describe such short times, and it is not clear in what sense the concept of time is meaningful for values smaller than the Planck time. It is generally assumed that quantum effects of gravity dominate physical interactions at this time scale.
How small is Planck time?
10-43 seconds
The Planck time is the time it would take a photon travelling at the speed of light to across a distance equal to the Planck length. This is the ‘quantum of time’, the smallest measurement of time that has any meaning, and is equal to 10-43 seconds. No smaller division of time has any meaning.
What is the oldest planet?
The planet is one of the oldest known extrasolar planets, believed to be about 12.7 billion years old….PSR B1620−26 b.
| Discovery | |
|---|---|
| Star | PSR B1620-26 AB |
| Physical characteristics | |
| Mass | 2.5 (± 1) M J |
| Temperature | 72 K (−201.2 °C; −330.1 °F) |
Are picoseconds faster than light?
The speed of light is 299,792,458 meters per second. A picosecond is 1 trillionth of a second. So, in 1 picosecond, light travels 0.000299792458 meters.
Is an attosecond faster than light?
A research team at the University of Central Florida has demonstrated the fastest light pulse ever developed, a 53-attosecond X-ray flash. At one-quintillionth of a second, an attosecond is unimaginably fast. In 53 attoseconds, light travels less than one-thousandth of the diameter of a human hair.
Is Planck length the size of the universe?
So to summarize, the Planck length is an important order of magnitude when quantum gravity is being discussed, but it is not the fundamental pixel size of the universe. Thanks to John Baez and Nima Lashkari for answering some questions about quantum gravity.
How big was the universe all the way back then?
By time you get to today, the observable Universe, at 13.8 billion years old, extends for 46.1 billion light years in all directions from us. So how big was it all the way back then, some 13.8 billion years ago? Let’s look to the Universe we see to find out. light years away. ESO/INAF-VST/OmegaCAM.
How far can light travel in Planck time?
This is how far light can go in a unit of Planck time, because the speed of light is the “Planck speed.” In SI units, this is on the order of 10 -35 meters.
What is Planck’s time?
So while the second is originally one-86400th of a day, the Planck time is based on the speed of light, Newton’s gravitational constant, and Planck’s (reduced) constant, which is twice the angular momentum of an electron.