How to Determine Direction in the Universe How to Determine Direction in the Universe

The concept of direction is artificially prescribed, such as southeast, northwest, and northwest, which are all things that people plan themselves in order to facilitate their survival on the earth! For example, the South Pole is the southernmost point, the North Pole is the northernmost point, and East and West are the direction of a concept, because there is no easternmost or westernmost point. When I explain the concept of direction to you in this way, I am telling you that direction is something that is thought to be prescribed, but it is not absolute!

In the universe, as long as you find a reference, you can do it, but there will be no direction!

Celestial bodies are usually introduced like this: "So-and-so star is located in such and such a constellation, how many light-years away from the Earth!" "If you know which constellation you are in, and if you know the distance, you will be able to determine the location, so there is no direction at all!

As the first floor says, there is no direction in the universe, only the relative positions of the celestial bodies. If you have to set a direction, you first need to set the coordinate system.

There is no direction in the universe, only relative positions, which can only be determined by the distance between the positions of the celestial bodies.

Do you mean in the vastness of the universe beyond Earth?

When we are on the earth, we only use the buildings on the earth as a reference or the sun as a reference. Of course, as the Earth rotates and revolves, these things in our minds change from time to time in the context of a certain boundary of the universe as a reference.

Oh, if you want to go out, you can use a certain planet as a base... However, all planets are in motion, and it is really difficult to find the real southeast, northwest, and northwest.

Hello! There is no way to discern the direction in the universe, according to the constellation, it is only on the earth, the earth is round, the universe is vast. There's no direction, and you don't have to discern the direction, if you can see the sun or the earth.

Mine, are you still satisfied?

Some. Three points determine a fixed space. It is three points in the spatial coordinate system.

Just like the latitude and longitude on the earth, there are three points in space.

Of course, this has to be built in a specific place, such as within the solar system, or within the Milky Way.

Star maps can be drawn to determine your orientation based on the relative positions of celestial bodies.

Then you need to establish a spatial coordinate system, and you will be able to identify the direction.

There is a direction on Earth because of gravity, and there is no direction in the universe

It should be a fixed coordinate, no direction.

If you have to ask, then you're going to have to reason with Einstein

It's better to go to the universe and think about this first.

Yes. You're all on top of me.

If there is no gravity, is there any direction?

Use gyroscopes to determine direction in the universe.

Gyroscopes are widely used in aviation, aerospace, and navigation.

When the gyro rotor rotates at high speed, the rotation axis of the gyroscope remains stable in the inertial space when there is no external moment acting on the gyroscope, that is, it points to a fixed direction; At the same time, it resists any force that changes the axial direction of the rotor. This physical phenomenon is called the axiality or stability of the gyroscope. Its stability varies with the following physical quantities:

1. The greater the moment of inertia of the rotor, the better the stability; 2. The greater the angular velocity of the rotor, the better the stability.

Use constellation directions. That's how we locate meteor showers now. Such as the "Leonid meteor shower" and so on.

This is no problem to use "nearby" in the solar system. But in the future, if you want to go on long-range interstellar voyages, you won't be able to do it (like Sirius, as some science fiction movies write). But there will definitely be a better way then.

There is no direction in the universe, because there is no air pressure in the universe, there is no gravity, and your blood will not flow normally in the universe, and all your sense of direction will be disrupted. And in all kinds of no magnetic field, gyroscopes you are not sure of one direction is not good to use.

The direction is prescribed by the human beings on the earth, and there is only a direction on the earth, and there is no direction in the universe!

Chinese gossip will definitely be used in the future.

In our daily lives, we usually use the north, south, east, and west to orient ourselves, but how do humans express direction in outer space? Is there a distinction between east and west, north and south in the universe?

No, because the universe is very vast, and the celestial bodies in the universe are moving all the time, it is very difficult to rely on reference objects to determine the direction like the earth.

The universe will certainly not be as easy to discern the direction as the earth, because the universe is so big that you don't even know where the universe begins.

Personally, I don't think it's easy to discern direction in the universe like on Earth, because all kinds of planets, stars and other planets in the universe are constantly moving.

In the earthly universe, it is certainly not like the earth, which can easily distinguish east, west, north and south, which requires the coordinates of the aeronautical chart to be able to distinguish, because in the universe, there is no east, west, north and south at all.

It's hard to discern direction in the universe. Because the earth can discern the direction by the magnetic field, but there is no magnetic field in the universe. So you can't discern the direction as easily as the Earth.

Because the universe is structured on a large scale, the distribution of matter is even.

Observations have shown that on a large scale, the distribution and average density of galaxies in the universe are repeated by about 1 billion light-years. That is, if you take a cube at any location in the universe on the scale of 1 billion light-years, the distribution and density of galaxies in it are about the same. Therefore, the universe looks the same from anywhere in the universe.

Here's a look at the universe with a 1 billion light-years of space, and each of these points of light is a huge galaxy similar to the Milky Way. The same goes for other sections.

The main way to discern direction is to find a reference, and secondarily, to use a relatively accurate star map as a reference.

At present, the human footprint has not yet gone out of the solar system, and for today's spacecraft, they can know their exact position (relative to the Earth, or the Sun) by using the relative positions of celestial bodies with known orbits such as the Earth, the Sun, and the Moon. Of course, it is also possible to use a known and definite star as a reference.

For long-distance interstellar travel, for now, it is suitable as a reference for large star clusters, or pulsars. Large clusters are easy to identify, and pulsars are known as cosmic beacons due to their ultra-high magnetic fields and stable rotation periods, and their relatively accurate positions can be found using triangular relationships and space-time transformations (eliminating the effects of cosmic expansion and gravitational distortion). Of course, if you have a very specific star map, you can also calculate the position (that is, use the relative positions of a large number of stars to locate them) through star map matching

At present, humans have not been able to draw a complete star map of the Milky Way, which also means that humans do not yet have the ability to explore deep space. But with the help of a large number of telescopes, that day will always come.

The small scale is different, and the large scale is the same.

On a small scale, from a few light-years to millions of light-years, the distribution of matter in the universe varies from sparse to dense, and galaxies vary from large to small.

On a large scale, such as tens of millions of light-years to 1 billion light-years, the distribution of matter in all directions in the universe becomes uniform, and the size, number, and distribution of each inner galaxy are basically the same.

Scientists have found that on a large scale, the universe repeats roughly 1 billion cubic light-years.

Here's a 1 billion light-year diagram of the structure of the universe. Each of these bright spots is a giant galaxy.