# [Physics] the limit of the universe

cosmologyspace-expansionspacetimeuniverse

Universe:

• Is there any limit or size of the universe?

• Or you can say is there any edge of the universe?

• How we can define the universe limit (either in some units or compare like)?

• Assume that universe has a boundary & it's like a square. Alright! We all including all planets and galaxies are inside this Square. Then What is outside?

This question arises whenever i think about the universe, i mean

• Where is the edge of Universe?

• Or What is outside of the Universe?

• Or either there is multi-universes (if there is, then what object hold all the universes).

Can anyone just simply imagine the limit of Universe or can define the
limit in just words, i'm curious…

Your thoughts would be helpful for the topic or for the people who want to know abut the Size, Edge, Limit or the Object who hold the Universe's.

Is there any limit or size of the universe?

No, since the curvature is flat it is very likely to be infinitely big

Or you can say is there any edge of the universe?

There are horizons like the particle horizon, the event horizon, the hubble radius and so on but behind this horizons we assume everything to be the same like in front of them.

How we can define the universe limit (either in some units or compare like)?

The event horizon and the hubble radius will converge to a distance of approximately 16 Gigalightyears in proper distances and the particle horizon to a little less than 65 Gigalightyears in comoving coordinates, for the evolution of the horizons see this plot.

Assume that universe has a boundary & it's like a square. Alright! We all including all planets and galaxies are inside this Square. Then What is outside?

The universe's curvature can be flat or sattles shaped, then it's infinite. It also can be positively curved, then it's finite (like the surface of the earth). But there is no way for space to be squared and finite.