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Is there anything that can move faster than the speed of light?

The answer to this is negative today but definitely positive regarding some time in the future and it is not about the neutrino particle

Landmarks in the expansion of the universe. From Wikipedia
Landmarks in the expansion of the universe. From Wikipedia

Answer: Yes, the universe itself will eventually move faster than the speed of light. It's complicated to explain exactly how this will happen, so let's start at the beginning: the Big Bang. About 14 billion years ago, all the matter in the universe was dispersed in all directions. That first explosion is still pushing galaxies outward. Scientists know this fact, in part because of the Doppler effect. The wavelengths of light from other galaxies deviate from their orbits as they move away from us, just as the pitch of an ambulance siren changes as it passes us.

Take for example the constellation Hydra, a cluster of galaxies about three billion light years away from us. Astronomers measured the distance from Earth to the Hydra by tracking the light coming from the cluster. Through a prism, the hydra's hydrogen appears as four bands of red, green-blue, purple-blue, and violet. But during the time it takes for the hydra's light to reach us, the bands of color drift downward toward the red end—the low energy end—of the spectrum. During light's journey across the universe, its wavelengths are stretched.

The farther the light travels, the more it stretches. The closer the strips deviate to the red end, the greater the distance the light travels. The size of the shift is called the redshift, and it helps scientists calculate the motion of stars in space. But Water Serpent is not the only galaxy cluster to exhibit redshift. Everything in the universe is deflected, because the universe is expanding. It's just easier to see the redshift of a water snake, because the farther away the galaxy is from ours, the faster it's receding from us.

There is no limit to how fast the universe can expand, says physicist Charles Bennett of Johns Hopkins University. Einstein's theory that nothing can move faster than the speed of light in a vacuum is still true, because space itself stretches, and space is nothing. Galaxies do not move in space, and away from each other, but with space - like raisins in a loaf of puffed bread. There are galaxies that are already so far away from us, and continue to move away from us at such a high speed, that their light will never reach Earth. "It's like running a five-kilometer race, but the track stretches while we run," says Bennett. "If it stretches faster than we are able to run, we will never get to where we are running." - Sarah Pecht

29 תגובות

  1. Turn on a light, isn't it faster than light???

  2. to Anat
    As far as I understand the meaning of the term "something" in the context in question
    associated with an amount of energy greater than zero. For example a possessive particle
    energy. As such its speed cannot exceed the speed of light.
    The examples you gave are about geometric points but they are not
    having physical values ​​such as energy.
    For example, a point of intersection between non-parallel lines (planes),
    is a mathematical but not a physical point. She has no
    Physical values ​​such as energy. Therefore its speed can increase
    on the speed of light

  3. Phenomena can travel faster than light
    For example a phase transition of a medium such as loss of magnetism as a result of heating
    The line of intersection between non-parallel planes moving in each other's direction
    And finally also non-local effects on entangled quantum particles.
    And even photons sometimes exceed the speed of light at distances smaller than the wavelength.
    And there are many more examples

  4. A Ben Ner,
    Although the light is emitted at a speed C, but the distance it must travel to reach us is greater than C*t and therefore it will never reach us.

  5. Ben Ner - the light outside the boundaries of the visible universe moves in an expanding universe (not that the light source is moving away from us and then your claim about a constant speed without dependence - is correct) and therefore will never reach us. Indeed, our observation range increases with the increase in the age of the universe (light year per year) - but this is not significant for us.

  6. The conclusion from my last response is that, assuming the universe is much larger
    From the 13,7 billion light years visible today, the range of observation is
    Ours on the universe, increasing over time.
    Emphasize ! It is not meant to include the means of observation, but rather that light from a distance
    Bigger ones will come to us in the future.

  7. To Arya Seter and Elli
    You are right in your claim that the theory allows that distant parts
    very much of the universe is moving away at a speed that exceeds the speed of light c and however,
    This does not explain why they are not visible? According to special relativity,
    The light emitted from them moves (also in our direction) at speed c, regardless of speed
    the expansion of space. The velocity transformation equation is not a vector connection
    but according to the Lorentz equations. Therefore we should see, after enough time, also
    the light emitted from galaxies moving away from us at a speed exceeding c.

  8. Golan,
    Exactly so, only verification is created after a short time, compared to distant galaxies the measurement today describes the situation in the distant past.

  9. jelly,
    Let our rabbis say, "everyone who disobeys is disobeyed (Kidoshin p. XNUMX)".
    Aren't these the claims that have been made recently against your own articles?
    Sorry but you're really picking up the slack here.

  10. I was expecting a slightly more detailed and long article, and not two and a half words that leave you with the same feeling of emptiness when you arrived... Nothing is explained about the effect that causes acceleration!

  11. It's good that there are readers who understood the article because I didn't understand what was written in it (because the author of the article didn't understand either...).

  12. Moti
    You can make the same claim for objects that are a few meters away from the measuring devices, since light takes time to cross this distance as well.

  13. It is usually forgotten, but the measured speed of the constellation Hydra is the speed of the group from 3 billion years ago (because it is distant from us at a distance of about three billion light years), as of this moment, what the speed of the group is, we will never know.
    It can be said that we are cut off from the universe, and what happens to the galaxies that are far away from us (including the measurement made according to redshift) is only a hypothesis.

  14. "The universe itself will eventually move faster than the speed of light." Sorry, why eventually, why not now? If I am not mistaken (and also as my commenter wrote), then the parts of the universe beyond the limits of the visible universe are moving away from us at a speed that exceeds the speed of light.

  15. Why can't you ever enlarge the images on this site?
    They said it once two years ago and still no one cares about it, what's the point?

  16. If I'm not mistaken, according to the theory there are already today galaxies at the other end of the universe that are moving away from it at a speed greater than the speed of light. We cannot see things in the universe from its "other side". As the illustration in the article shows, our picture of the universe is quite limited, the universe has spread in all directions and we see a certain cross-section of it (because of the speed of light).

  17. If so, then when will the universe reach the speed of light???
    Maybe it will happen after all the matter loses its energy and it "freezes" and then it actually all happens when there is no "observer" who can witness such an event and thus the universe seems to solve the problem...

  18. No, you can't say we're shrinking. While the expansion of the universe can be explained with the physics we know, there is no possible explanation for everything suddenly contracting.

  19. Gravitational forces are known to distort space, including light waves
    How can we learn, from the rays of light that reach us from space, without knowing
    What forces influenced them and what sites or materials did they pass through, on their way
    The longest to us from distances or times of billions of light years?

  20. Instead of saying that space is stretching, can we say that we are contracting? Will it be considered? Or is there something preventing the relativity in perspective?

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