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The radius of the observable universe is therefore estimated to be about 46.5 billion light-years. [8] [9] Using the critical density and the diameter of the observable universe, the total mass of ordinary matter in the universe can be calculated to be about 1.5 × 10 53 kg. [10]
The smallest such d is called the diameter of the universe, ... [17] and an optimal orientation on the sky for the model was estimated in 2008. [10]
Because humans cannot observe space beyond the edge of the observable universe, it is unknown whether the size of the universe in its totality is finite or infinite. [3] [57] [58] Estimates suggest that the whole universe, if finite, must be more than 250 times larger than a Hubble sphere. [59]
The Hercules–Corona Borealis Great Wall (HCB) [1] [5] or simply the Great Wall [6] is a galaxy filament that is the largest known structure in the observable universe, measuring approximately 10 billion light-years in length (the observable universe is about 93 billion light-years in diameter).
IC 1101 is a class S0 supergiant lenticular galaxy at the center of the Abell 2029 galaxy cluster.It has an isophotal diameter at about 123.65 to 169.61 kiloparsecs (400,000 to 550,000 light-years).
Visualization of the whole observable universe.The inner blue ring indicates the approximate size of the Hubble volume. In cosmology, a Hubble volume (named for the astronomer Edwin Hubble) or Hubble sphere, Hubble bubble, subluminal sphere, causal sphere and sphere of causality is a spherical region of the observable universe surrounding an observer beyond which objects recede from that ...
M87 is one of the most massive galaxies in the local Universe. Its diameter is estimated at 132,000 light-years, which is approximately 51% larger than that of the Milky Way. [5] [6] As an elliptical galaxy, the galaxy is a spheroid rather than a flattened disc, accounting for the substantially larger mass of M87.
Archimedes had estimated that the Aristarchian Universe was 10 14 stadia in diameter, so there would accordingly be (10 14) 3 stadium-spheres in the universe, or 10 42. Multiplying 10 21 by 10 42 yields 10 63, the number of grains of sand in the Aristarchian Universe. [6]