# How big was the universe during the Planck epoch?

## How big was the universe during the Planck epoch?

The Planck Epoch “…we have a viable theory of the universe back to about 10-30 seconds. At that time, the currently observable universe was smaller than the smallest dot on your TV screen, and less time had passed than it takes for light to cross that dot.”

**How big is the universe in Planck lengths?**

The observable universe is in the neighborhood of 1027 meters across. The planck length is about 10-35 meters. That means the number of planck length cubes that will fit in the observable universe is around ( 1027 / 10-35 )3 = 10186 .

**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) |

### How long was the Planck epoch?

Planck Epoch (or Planck Era), from zero to approximately 10-43 seconds (1 Planck Time): This is the closest that current physics can get to the absolute beginning of time, and very little can be known about this period.

**How big was the universe at the beginning?**

In the first period, the universe grew from an almost infinitely small point to nearly an octillion (that’s a 1 followed by 27 zeros) times that in size in less than a trillionth of a second. This inflation period was followed by a more gradual, but violent, period of expansion we know as the Big Bang.

**How big was the universe at the end of inflation?**

According to this paper at the end of inflation the universe’s scale factor was about 10−30 smaller than it is today, so that would give a diameter for the currently observable universe at the end of inflation of 0.88 millimeters which is approximately the size of a grain of sand (See calculation at WolframAlpha).

## Is Quark smaller than Planck length?

The size of a quark compared to plank length is multitudes larger than plank length. For comparison, if the quark was the size of the sun, the plank length would be the size of a grain of sand.

**Is a singularity smaller than the Planck length?**

All you need to know is that, in theory, nothing can go smaller than a Planck length. This sounds very contradictory to the concept of a singularity at the heart of a black hole, which is dimensionless so is far smaller than a Planck length!

**Can something be smaller than Planck length?**

So why is the Planck length thought to be the smallest possible length? The simple summary of Mead’s answer is that it is impossible, using the known laws of quantum mechanics and the known behavior of gravity, to determine a position to a precision smaller than the Planck length.

### What was the Planck epoch?

In cosmology In Big Bang cosmology, the Planck epoch or Planck era is the earliest stage of the Big Bang, before the time passed was equal to the Planck time, tP, or approximately 10−43 seconds.

**How fast is Planck time?**

Planck time is roughly 10−44 seconds. However, to date, the smallest time interval that was measured was 10−21 seconds, a “zeptosecond.” One Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to one Planck length.

**How big is the unobservable universe?**

46.508 billion light yearsObservable universe / Radius

The radius of the observable universe is therefore estimated to be about 46.5 billion light-years and its diameter about 28.5 gigaparsecs (93 billion light-years, or 8.8×1026 metres or 2.89×1027 feet), which equals 880 yottametres.