Vacuum astrophysics

  • Does perfect vacuum exist?

    Ultimately, a perfect vacuum isn't possible because quantum theory dictates that energy fluctuations known as 'virtual particles' are constantly popping in and out of existence, even in 'empty' space.
    Read more: How can something explode in the vacuum of space?.

  • Does vacuum energy exist?

    Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
    The vacuum energy is a special case of zero-point energy that relates to the quantum vacuum..

  • How many atoms are in a vacuum?

    A vacuum is not nothing.
    It is only a region of three-dimensional space that is entirely devoid of matter, entirely devoid of particles.
    The best laboratory vacuum contains about 25 particles (molecules, atoms) per cubic centimeter (cm3)..

  • How much vacuum energy is in the universe?

    Using the upper limit of the cosmological constant, the vacuum energy of free space has been estimated to be 10−9 joules (10−2 ergs), or ~5 GeV per cubic meter..

  • How much vacuum is in space?

    The vacuum of space is only -14.7 psi compared to normal air.
    You probably wouldn't want to vacation there, but it's not enough to explode you Hollywood style.
    Medical oxygen tanks are pressurized up to 2200 psi.
    That's 150 times greater pressure difference than inside your body and the vacuum of space..

  • How powerful is the vacuum of space?

    Using the upper limit of the cosmological constant, the vacuum energy of free space has been estimated to be 10−9 joules (10−2 ergs), or ~5 GeV per cubic meter..

  • Is it possible to make a perfect vacuum?

    Ultimately, a perfect vacuum isn't possible because quantum theory dictates that energy fluctuations known as 'virtual particles' are constantly popping in and out of existence, even in 'empty' space.
    Read more: How can something explode in the vacuum of space?.

  • Is there 100% vacuum in space?

    Outer space is not completely empty; it is a near-perfect 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..

  • Is there a vacuum in space?

    Outer space is not completely empty; it is a near-perfect 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..

  • Is vacuum energy infinite?

    In the standard quantum field theory, not only does the vacuum (zero-point) energy have an absolute infinite value, but also all the real excited states have such an irregular value; this is because these energies correspond to the zero-point energy of an infinite number of harmonic oscillators ( )..

  • What is the cosmic vacuum?

    Recent observational studies of distant supernovae have suggested the existence of cosmic vacuum whose energy density exceeds the total density of all the other energy components in the Universe.
    The vacuum produces the field of antigravity that causes the cosmological expansion to accelerate..

  • What is the vacuum catastrophe theory?

    In cosmology, the cosmological constant problem or vacuum catastrophe is the substantial disagreement between the observed values of vacuum energy density (the small value of the cosmological constant) and the much larger theoretical value of zero-point energy suggested by quantum field theory..

  • What is the vacuum density of the universe?

    The vacuum energy density of the Universe based on 2015 measurements by the Planck collaboration is ρvac = 5.96\xd710−27 kg/m3 ≘ 5.3566\xd710−10 J/m3 = 3.35 GeV/m3 or about 2.5\xd710−47 GeV4 in geometrized units..

  • What is the vacuum energy in astronomy?

    Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
    One contribution to the vacuum energy may be from virtual particles which are thought to be particle pairs that blink into existence and then annihilate in a timespan too short to observe..

  • What is the vacuum problem in physics?

    In cosmology, the cosmological constant problem or vacuum catastrophe is the substantial disagreement between the observed values of vacuum energy density (the small value of the cosmological constant) and the much larger theoretical value of zero-point energy suggested by quantum field theory..

  • What is the vacuum state of the universe?

    According to present-day understanding of what is called the vacuum state or the quantum vacuum, it is "by no means a simple empty space".
    According to quantum mechanics, the vacuum state is not truly empty but instead contains fleeting electromagnetic waves and particles that pop into and out of the quantum field..

  • What is the vacuum theory?

    Superfluid vacuum theory (SVT), sometimes known as the BEC vacuum theory, is an approach in theoretical physics and quantum mechanics where the fundamental physical vacuum (non-removable background) is considered as a superfluid or as a Bose–Einstein condensate (BEC)..

  • What is vacuum energy in astronomy?

    Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
    One contribution to the vacuum energy may be from virtual particles which are thought to be particle pairs that blink into existence and then annihilate in a timespan too short to observe..

  • What is vacuum in cosmology?

    Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
    The vacuum energy is a special case of zero-point energy that relates to the quantum vacuum..

  • What is vacuum in particle physics?

    According to present-day understanding of what is called the vacuum state or the quantum vacuum, it is "by no means a simple empty space".
    According to quantum mechanics, the vacuum state is not truly empty but instead contains fleeting electromagnetic waves and particles that pop into and out of the quantum field..

  • Why is there a vacuum in space?

    The vacuum of outer space is not caused by the expansion of the universe, but is caused by gravity.
    First of all, when we say outer space (the space outside the atmosphere of planets and stars) is a "vacuum" or is "empty", we really mean that outer space is nearly empty or almost a perfect vacuum..

  • According to present-day understanding of what is called the vacuum state or the quantum vacuum, it is "by no means a simple empty space".
    According to quantum mechanics, the vacuum state is not truly empty but instead contains fleeting electromagnetic waves and particles that pop into and out of the quantum field.
  • According to this study, a potentially catastrophic vacuum decay could be triggered at any time by primordial black holes, should they exist.
    The authors note, however, that if primordial black holes cause a false vacuum collapse, then it should have happened long before humans evolved on Earth.
  • Despite the rejection of the cosmological constant by Einstein and others, the modern understanding of the vacuum, based on quantum field theory, is that vacuum energy arises naturally from the totality of quantum fluctuations…
  • In cosmology, the cosmological constant problem or vacuum catastrophe is the substantial disagreement between the observed values of vacuum energy density (the small value of the cosmological constant) and the much larger theoretical value of zero-point energy suggested by quantum field theory.
  • In quantum field theory, the quantum vacuum state (also called the quantum vacuum or vacuum state) is the quantum state with the lowest possible energy.
    Generally, it contains no physical particles. Zero-point field is sometimes used as a synonym for the vacuum state of an individual quantized field.
  • Outer space is not completely empty; it is a near-perfect 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.
  • Superfluid vacuum theory (SVT), sometimes known as the BEC vacuum theory, is an approach in theoretical physics and quantum mechanics where the fundamental physical vacuum (non-removable background) is considered as a superfluid or as a Bose–Einstein condensate (BEC).
  • The vacuum level is the energy level that a particle far away from the material would have.
    This should be the same everywhere in space and for all materials i.e. for the metal and semiconductor.
  • Vacuum energy can also be thought of in terms of virtual particles (also known as vacuum fluctuations) which are created and destroyed out of the vacuum.
    These particles are always created out of the vacuum in particle–antiparticle pairs, which in most cases shortly annihilate each other and disappear.
  • Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
    One contribution to the vacuum energy may be from virtual particles which are thought to be particle pairs that blink into existence and then annihilate in a timespan too short to observe.
  • vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there.
    It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).
However, in quantum electrodynamics, consistency with the principle of Lorentz covariance and with the magnitude of the Planck constant suggests a much larger  ,In modern physics the vacuum is a sea of virtual positron electron pairs, continually coming into existence and annihilating.
Sometimes, when these virtual pairs come across energetic particles they can interact with them and produce real particles at the expense of the third body.,Introduction to Astrophysics/Vacuum Energy Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
One  ,Using the upper limit of the cosmological constant, the vacuum energy of free space has been estimated to be 10−9 joules (10−2 ergs), or ~5 GeV per cubic meter.,Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
One contribution to the vacuum energy may be from virtual particles which are thought to be particle pairs that blink into existence and then annihilate in a timespan too short to observe.,Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
The vacuum energy is a special case of zero-point energy  ,Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
One contribution to the vacuum energy may be from  ,Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.
The vacuum energy is a special case of zero-point  ,Vacuum energy is an underlying background energy that exists in space throughout the entire Universe.

Can vacuum fluctuations be controlled in future experiments?

Future experiments may not only address the nature of vacuum fluctuations, but moreover offer the possibility to control chemical reactions or superconducting currents, merely by switching the vacuum field on the shortest relevant time scales

What is the best vacuum attainable in a lab?

The best vacuum attainable in a lab is nowhere near what is attainable in space, even near-Earth space

For example, low Earth orbit space is considered to be both vacuum (it's a much himgher quality vacuum than any vacuum attainable in an Earth-bound vacuum chamber) and yet still in the atmosphere

Space isn't an absolute vacuum

Vacuum does not mean a space that is completely devoid of matter, dark matter, or photons. While a perfect vacuum makes for a very nice spherical c...2

Space isn't an absolute vacuum. Even in intergalactic space there a few atoms in a sufficiently large volume (like a $m^3$). In some respects you c...1

How is space a vacuum when there are planets, gases, etc? Gravity and solar wind scrubs most of it away! Lucky for us gravity pulls stuff togethe...0

As Allure points out , space isn't a pure vacuum, but it's still better than any vacuum we can make. But how does that very, very good vacuum add u...12

As people like to think,Vacuum is space that is devoid of matter like air etc. Space is not strictly a vacuum at all places, but it is better vacuu...4

Basically speaking, the space used to be a gigantic nebula, but most of it collapsed, forming the primordial stars. These stars went supernova, spr...2

See, in space it is not a perfect vaccum. Now there is matter that exists like gas clouds-which collapse under their own gravity (they have a mass...0

Your question implies that there can't be init acceleration / momentum in a vacuum. If people like you and me speak about a vacuum, we mean nothing...


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