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The Hubble sphere
- The Hubble sphere, named after Edwin Hubble, who discovered the expansion of the universe back in the 1920s, is the sphere beyond which galaxies are receding away from us faster than light.
medium.com/the-infinite-universe/why-galaxies-receding-faster-than-the-speed-of-light-are-still-visible-664ff21f0829
May 13, 2023 · According to Huygens, an expanding sphere of light behaves as if each point on the wave front were a new source of radiation with the same frequency and phase as the preceding one. Because electromagnetic waves have fluctuating electric and magnetic fields, they are called electromagnetic waves.
Oct 10, 2024 · The Hubble sphere, named after Edwin Hubble, who discovered the expansion of the universe back in the 1920s, is the sphere beyond which galaxies are receding away from us faster than light....
Jan 12, 2022 · A finite expanding universe conjures up the idea that it would have a boundary or edge, separating it from something beyond.
Sep 17, 2024 · The universe is expanding, and that expansion stretches light traveling through space in a phenomenon known as cosmological redshift. The greater the redshift, the greater the distance the light has traveled.
This cosmological expansion affects all things: dust, stars, planets, and even light. Thus, the wavelength of light (\(\lambda\))emitted by distant galaxies is “stretched” out. This makes the light appear “redder” (lower energy) to the observer—a phenomenon called cosmological redshift .
The comoving distance from Earth to the edge of the observable universe is about 14.26 giga parsecs (46.5 billion light-years or 4.40 × 10 26 m) in any direction. The observable universe is thus a sphere with a diameter of about 28.5 gigaparsecs [27] (93 billion light-years or 8.8 × 10 26 m). [28]
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Apr 30, 2021 · Because the Universe is expanding, the proper distance between two distant objects (which aren’t held together by gravity) increases with time. In the example below, light is emitted from a galaxy which 300 million years ago was at a proper distance of 294 million light years from Earth.
