Why matter in space doesn t break down

You have to understand what this "must" is.

The decomposition pressure of most stable compounds is extremely weak, which causes it to decompose extremely slowly, and it may take billions, tens of billions, or even hundreds of billions of years to completely decompose.

The universe is not really a vacuum, and the weak partial pressure of a particular gas in the universe is likely to be much greater than the decomposition pressure of matter, resulting in a fact that matter cannot be decomposed at all.

Third, compounds are constantly formed in the universe, and as long as the rate of formation is greater than the rate of decomposition, there must be a large number of them.

Fourth, the decomposition pressure is positively correlated with temperature, the higher the temperature, the smaller the decomposition pressure usually is, and the temperature in the universe is often close to absolute zero, when the molecular activity is very weak, and the decomposition of matter is even slower.

It's just infinitely close to 0, not absolutely 0, if it's really 0 pressure, the spacecraft won't explode early, and there are a lot of so-called dark matter in space, although it can't be observed, but many phenomena indicate the existence of matter of this nature in the universe, so since it's still made of matter, then its pressure is not 0, and naturally there won't be the kind of problem you said.

It is true that it is difficult to have compounds in a vacuum environment, but a large amount of material will accumulate to form meteorites and asteroids, so it is not a vacuum.

A steel bar, a stone, a water glass, ,...These things can be combined not because of the gravitational force between molecules, but because of the binding force of atoms or intermolecular chemical bonds, which is essentially an electromagnetic force. Magnitatively, the electromagnetic force is about 10 36 times stronger than the gravitational force.

In space, the easing force becomes weak, but the binding force between atoms and molecules inside the substance does not change, so the object will not disperse in space. For example, planets, comets, meteoroids, etc., can all exist stably under the conditions of microgravity in space.

a. When an astronaut enters space, the position has changed, and the mass of the slide will not change, so A is wrong;

B. Sharpen and grind a cube of wood into a wood ball, the material contained in the wood block becomes less, and the mass becomes smaller, so B is wrong;

c. The mass of the object is related to the density and the volume of the body, and the volume relationship is unknown, and the mass cannot be determined.

D. After the water freezes, the state changes, and the quality remains the same, so D is wrong, so C is selected

The matter that exists in the universe is exactly the same as the matter that has been found on Earth, without any difference.

There are 92 chemical elements on Earth, and these elements are also present in space, one is not more, and one is not less. In addition to 92 elements, there are various subatomic particles in space. These particles have also been found on Earth (or made in particle accelerators).

That is, what is in space is also found on Earth. What is on Earth is also found in space.

First of all, to be clear, neutron stars that we can understand are only the size of the Earth, but their masses are the size of the Sun. And then there's the neutron star that we don't understand at the moment, it's so big and heavy that we think it's a black hole, but it's not a black hole.

Neutron stars are stars that are larger than our Sun and are formed by the collapse of stellar matter due to internal gravity after nuclear combustion and a long period of evolution. If it is not much larger than the Sun, it collapses into a white dwarf. If it is larger, gravity will compress the electrons inside the atoms on the white dwarf into the nucleus, turning all the protons into neutrons.

This remnant of a star made up of neutrons is a neutron star. Stars with more mass will further collapse to form black holes.

If you just want to move a small piece of matter from the neutron star to the Earth, away from the environment of the neutron star, that form of matter will no longer exist. It will exist in a form of matter close to that of Earth. You can't get a 10,000-ton cube on Earth.

Of course, with the known laws of physics, there is no way to break down a small piece of matter on a neutron star.

If you want to move the neutron star as a whole to the vicinity of the Earth, unfortunately, all matter on Earth will exist in neutron form. Because neutron stars have about the same mass as the Sun, the Earth has very little mass. Before the Earth approached the neutron star, the Earth was torn apart by the huge gravitational pull of the neutron star and ceased to exist.