Is the universe infinite If not, what is extravagant?

The universe is bounded and infinite, as for the outside, the universe refers to time and space, and the word "outside" refers to space, for example, we say outside the house, because there is space outside the house, and the universe itself is space-time, so it is meaningless to say "outside of time and space", just like you can't say "what is the earth on", hehe, keep thinking, good luck.

The universe is the general term for all things, the unity of time and space. The universe is a material world, which exists objectively and does not depend on human will, and is in constant motion and development, with no beginning and no end in time, no boundary and no end in space. The universe is diverse and unified; diversity in the diversity of material manifestations; Unity lies in its materiality.

By definition, the universe is boundless, so there is no such thing as extracosmic.

When you say outside the universe, you mean outside the scope of the universe as we currently know it, as long as it has matter and space and can be perceived by people, then it is still a part of the universe.

It's still the universe out there! Universe 2! Universe 3! Boundless! There may be one or more of them that are exactly the same as this world! Like you in another universe!

Now even the size of the universe is not known.

How to know what's out there.

It is unlikely that humans will fly out of the solar system.

What's more, the solar system is still in the Milky Way, and the Milky Way is a few grains of dust in the universe.

For example, a little ant is on an isolated continent and comes to the beach to look out and wants to know what is on the other side of the sea, but he never knows. So what is over there doesn't make sense to him.

Don't think of the universe as a shelled sphere, in fact, the universe in the usual sense refers to the space that stands from the perspective of human beings and is within the scope of our ability to perceive. However, the universe expands faster than the speed of light, which means that we cannot perceive the regions outside of it, which makes no sense to us.

The answer to the question of whether the universe is infinite is yes, at least with human capabilities, there are always places that cannot be perceived.

The multiverse, who knows, no one has proven it, there is no way to prove it, maybe it is infinite...

What is outside? What is this concept of the outside world for the universe? If we take the universe as a reference, what kind of scale should we define?

Upstairs (1-5 12:00) is a good answer! Simple and easy to understand!

For example, of course, when humans don't know that the earth is round, they wonder if the earth has edges, and if so, what is outside?

And now that human beings have clearly found the answer, your question is the same, no one can now, maybe there is courage to not be able to confirm it, I believe that one day, human beings will find the answer!

The universe is bounded and infinite.

The universe is physically defined as all space and time (collectively referred to as space-time) and their connotations, including all forms of energy, such as electromagnetic radiation, ordinary matter, dark matter, dark energy, etc., of which ordinary matter includes planets, moons, stars, galaxies, galaxy clusters and intergalactic matter.

The universe also includes physical laws that affect matter and energy, such as conservation laws, classical mechanics, relativity, etc.

The Great Theory is a modern cosmological description of the evolution of the universe. According to the estimates of this theory, space and time appeared together after the great ** of 100 million years ago, and as the universe expanded, the energy and matter that originally existed became less dense.

The universe gradually cooled and continued to expand, allowing the first subatomic particles and simple atoms to form. Dark matter gradually accumulates and forms foam-like structures, large-scale fibrous structures and cosmic holes under gravitational pull. Huge clouds of hydrogen-helium molecules were gradually drawn to the densest concentrations of dark matter, forming the first galaxies, stars, planets, and everything.

Space itself is expanding, so objects that are currently 46.5 billion light-years away from Earth can be seen, because these lights were produced 13.8 billion years ago and were closer to Earth than they are today.

While the size of the entire universe is unknown, the size of the observable universe can be measured, with an estimated diameter of 93 billion light-years. In various multiverse theories, a universe is one of the components of a multiverse on a larger scale, and each universe itself includes all of its space and time and its matter.

With the gradual improvement of the level of sky survey observation technology, human beings continue to try to draw the whole picture of the entire universe. On January 14, 2021, the National Astronomical Observatories' Beijing-Arizona Sky Survey (BASS) team and the Dark Energy Spectroscopic Survey (DESI) team jointly released the latest huge 2D universe map.