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If the universe is homogeneous at a large scale, then there would be four times as many stars in a second shell between 2,000,000,000 and 2,000,000,001 light years away. However, the second shell is twice as far away, so each star in it would appear one quarter as bright as the stars in the first shell.
There are some reasons to be cautious about this list: The Zone of Avoidance, or the part of the sky occupied by the Milky Way, blocks out light from several structures, making their limits imprecisely identified. Some structures are too distant to be seen even with the most powerful telescopes. Some structures have no defined limits, or endpoints.
Second brightest star in the night sky. Gacrux (γ Crucis) 73 [92] L/T eff: Twenty-sixth brightest star in the night sky. Polaris (α Ursae Minoris) 46.27 ± 0.42 [93] AD The current star in the North Pole. It is a Classical Cepheid variable, and the brightest example of its class. Aldebaran (α Tauri) 45.1 ± 0.1 [94] AD Fourteenth brightest ...
That means there’s something in the underlying physics of our universe that remains a mystery. The Hubble tension is one of the most hotly debated discrepancies in all of astronomy.
The universe's expansion rate, a figure called the Hubble constant, is measured in kilometers per second per megaparsec, a distance equal to 3.26 million light-years.
The universe is a four-dimensional spacetime, but within a universe that obeys the cosmological principle, there is a natural choice of three-dimensional spatial surface. These are the surfaces on which observers who are stationary in comoving coordinates agree on the age of the universe .
The expansion of space summarized by the Big Bang interpretation of Hubble's law is relevant to the old conundrum known as Olbers' paradox: If the universe were infinite in size, static, and filled with a uniform distribution of stars, then every line of sight in the sky would end on a star, and the sky would be as bright as the surface of a ...
Largest Galaxy in the Local Group (The Milky Way is the second largest), with at least 19 satellite galaxies. Barred spiral galaxy. 152,000 ly 87 Pegasus Dwarf Spheroidal (Andromeda VI) dSph [53] 2.55 [52] 0.78 −10.80 [7] 14.05 [1] Local Group: Satellite of Andromeda [7] 88 Perseus I (Andromeda XXXIII) 2.560 0.785 [63] −10.3 [63] 14.19 [63 ...