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Anonymous asked in Science & MathematicsAstronomy & Space · 1 month ago

What is space made of?

17 Answers

  • ?
    Lv 7
    1 month ago
    Favourite answer

    Quantum mechanically,  space is a quantum vacuum with all existing fields at their zero point values. The fields of the quantum vacuums fluctuate due to the energy-time uncertainty principle, producing temporary pairs of virtual particles. The quantum vacuum may be a true vacuum, or may be at metastable minima called a false vacuum. Obviously, this is an idealization. In practice, any place in the universe will be subject to additional fields from nearby charges, masses, etc. Since quantum fields exist in a background spacetime, quantum mechanics doesn’t really help understanding what spacetime is, only what’s in it.

    From the standpoint of general relativity, it’s a little different. While general relativity defines the geometry of spacetime due to the presence of matter/energy distributions, it never really says what it is. It simply specifies a metric, which is the definition of how we make measurements of spacetime in a way that preserves the laws of physics regardless of reference frame or presence of matter/energy. The metric is used to compute things like curvature and the dynamics of bodies in a gravitational field.

    The metric has also been used in trying to quantify and describe gravitational energy. One would think that gravitational energy might be some sort of ‘substance’ of spacetime. Unfortunately, there is no agreed way to do it, but there have been various proposals (e.g.  Landau–Lifshitz pseudotensor). They all use the metric.

    Just to wind up my ramblings, general relativity does supply us with the notion that nothing depends on a background spacetime. You can basically chose any spacetime you want without changing the physics. That strongly implies that space is RELATIONAL. It only has meaning in terms of relationships between fields, and may have no absolute meaning at all. But, that’s a complex topic ....

  • Anonymous
    1 month ago

    same thing your head is made of lol

    nothing LOL

  • Rita
    Lv 6
    1 month ago

    Outer space is not completely empty—it is a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, neutrinos, dust, and cosmic rays.

  • garry
    Lv 6
    1 month ago

    nothing why , just a few lumps of dirt floating are .  but the rest is nothing .

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  • Anonymous
    1 month ago

    Many elements of existence that remain unrelated to time.

  • 1 month ago

    In astrophysics, there is no such thing as space and there is no such thing as time.  It is spacetime - one word for one thing.  Spacetime is also the same as universe.  It is created by the gravity of mass.  So the universe is finite - not infinite.  The universe creates itself as mass movers outward.

  • 1 month ago

    It is essentially a vacuum(nothing). However  there will be some well spaced atoms of hydrogen and helium . 

  • ANDY
    Lv 5
    1 month ago

    When one mentions the word space, it could have three meanings: The universe as a whole, only celestial bodies, or space between celestial bodies. I suppose you meant the latter.

    Space is not a vacuum as many believe. It is full of particles, mostly protons, electrons, and dust─dust here is not the kind you'd see on a shelf at home, but rather particles as small as the smoke of, say, a cigarette. However, the density of such materials is very low. In certain locations it could be as many as millions of particles in one cubic meter, in others as scarse as only a few in a cubic meter. but never total vacuum. (Bear in mind that 1 gram of hydrogen on Earth contains 602, 000,000,000,000,000,000,000 atoms─you can readily see the difference in densities)

    In addition to this, you will find energy fields, neutrinos, the Higgs field (bosons), dark matter, and last but not least dark energy. This is what space is made of.

  • Joe
    Lv 4
    1 month ago

    physics                          .

  • 1 month ago

    Space is not a thing but a relationship.

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