How Big is the universe?

Krishna: The total size of the universe is not known, and some scientists think it could be many times larger than the observable portion. For example, one hypothesis suggests it could be at least 250 times larger, according to the Scale of the Universe. It may be infinite in extent.

Human mind hasn’t reached a stage to correctly estimate the size of the universe.

However, the ‘observable’ universe has a diameter of approximately 93 billion light-years. This means that the distance from one edge of the observable universe to the other, passing through Earth, is about 93 billion light-years. The observable universe is a sphere with a radius of about 46.5 billion light-years from Earth. However, the entire universe is thought to be much larger, potentially infinite, and possibly even larger than 500 times the observable universe, though its true size is unknown. (1,2)

“The diameter of the observable universe is approximately 93 billion light-years”(2). This refers to the distance across the portion of the universe that we can currently see from Earth. The true size of the entire universe is unknown and likely much larger.

Moreover, the universe has been expanding since the ‘Big Bang’ (?), meaning that the light we see from distant objects has been traveling towards us for billions of years, and the objects are now further away than the distance light has traveled. Some regions of space are expanding away from us faster than the speed of light, making them permanently unobservable.

So the simple answer to your question is ‘we don’t know …… yet’!

Footnotes:

1. Observable universe - Wikipedia
2. Universe - Wikipedia