Why is the universe infinite Do you know why the universe is infinite?

Theoretically, yes.

The universe is infinite, because the universe refers to the sum of all material space and time, and time is infinite.

The word "universe" probably originated from the famous ancient philosopher Mozi (about 468-376 BC). He used "universe" to refer to the east, west, south, and north, and the space in all directions, and "Zhou" to refer to the time of the past and the present. Past, present, or future; Is it a recognized, or an unrecognized......In short, everything is everything.

From a philosophical point of view. It is believed that the universe has no beginning and no end, and that it is boundless. However, we are not going to go deep into this esoteric concept, and we will leave it to philosophers to study.

We might as well zoom out a little and talk about the universe that can be understood and observed using the science and technology available to us, which people call "our universe" or "total galaxy".

According to the latest observations, the farthest galaxy that has been observed from us is 13 billion light-years. That is, if a beam of light is emitted from the galaxy at a speed of 300,000 kilometers per second, it will take 13 billion years to reach Earth. This distance of 13 billion light-years is the extent of the universe as we know it today.

To be clear, the extent of the universe as we know it today, or size, is a spherical space centered on the Earth and radiated by a distance of 13 billion light-years. Of course, the Earth is not really the center of the universe, and the universe is not necessarily a sphere, but we can only understand this extent due to our current observation capabilities.

In this spherical space with a radius of 13 billion light-years, about 125 billion galaxies have been discovered and observed, and each galaxy has hundreds to trillions of stars like the Sun. So with a simple math problem, it's not hard to see how many stars there are in the universe that we've observed. In such a vast universe, the earth is really like a drop in the ocean, so small that it is insignificant.

Is the universe really infinite? Does the universe have boundaries? Is there a definite conclusion on the size of the universe?

The universe itself is the meaning of time, infinity in space.

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.