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Space Fata Morgana is a new hypothesis in astrophysics that was proposed by P.R. Doorn in his book 'Space Fata Morgana' published on the 9th of April 2024. The hypothesis aims to provide an alternative explanation for the cosmic redshift observed in light originating from distant galaxies. The current consensus is that this is caused by the Doppler effect resulting from the velocity at which the galaxy is moving away from us. Doorn's hypothesis suggests that point sources such as stars do not emit radiation in the form of a 3-dimensional sphere (as one would expect in a 3-dimensional universe), but rather in the shape of a 4-dimensional sphere, or 4-sphere. When these 4-dimensional wavelengths are then measured in a 3-dimensional setup, due to the vast distance to the source and the 4-dimensional curvature of the universe, the wave will always be measured at an angle, causing it to appear stretched and even more so as the distance to the source increases. Therefore, even if the source is stationary, increasing redshift will be measured as the distance grows. In his book he uses a flat 2-dimensional universe, as an analogy, to explain Space Fata Morgana. This flat universe is curved into a third dimension, making it look like a giant 'soap bubble' with flat galaxies on the surface. The stars in this universe emit their light not in a 2-dimensional shape (as one would expect in a 2-dimensional universe), but in a 3-dimensional shape. When the wavelength of a stationary source at the 'top' of this universe is measured at the 'bottom' of this universe, the waves will be stretched. And this redshift increases with distance. Similary, when in our 3-dimensional universe light is emitted in the shape of a 4-dimensional sphere (or: 4-sphere), observers will also measure a 'natural' redshift with distance, as the wavelength of the 4-dimensional waves can only be measured in a 3-dimensional setup, which is always at an angle, which also increases by distance. Since distance, not velocity, determines the degree of redshift in this scenario, it means that stretched wavelengths should be measurable in every direction of the universe, explaining cosmic background radiation. As the wavelength of visible light is also stretched, the universe appears black in color. Additionally, with this hypothesis, there is no longer any reason to assume that the universe is expanding.
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