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Obsidian scalpels may be purchased for surgical use on research animals. [65] The major disadvantage of obsidian blades is their brittleness compared to those made of metal, [66] thus limiting the surgical applications for obsidian blades to a variety of specialized uses where this is not a concern. [62]
Discovered through gamma-ray burst mapping. Largest-known regular formation in the observable universe. [8] Huge-LQG (2012–2013) 4,000,000,000 [9] [10] [11] Decoupling of 73 quasars. Largest-known large quasar group and the first structure found to exceed 3 billion light-years. "The Giant Arc" (2021) 3,300,000,000 [12] Located 9.2 billion ...
Here the sun shows its face at dawn. Sky that is seeing during the day. 8 Ilhuicatl-Nanatzcayan; Ilhuicatl-Itzapan-Nanatzcayan "Where the obsidian knives are creaking" Mictlantecuhtli, god of death and ruler of Mictlan (the Underworld). Mictecacihuatl, goddess of death and ruler of Mictlan (the Underworld).
380 Earth radii (very inaccurate, true=16000 Earth radii) Aristarchus of Samos made a measurement of the distance of the Sun from the Earth in relation to the distance of the Moon from the Earth. The distance to the Moon was described in Earth radii (20, also inaccurate). The diameter of the Earth had been calculated previously.
Many trans-Neptunian objects (TNOs) have been discovered; in many cases their positions in this list are approximate, as there is frequently a large uncertainty in their estimated diameters due to their distance from Earth. Solar System objects more massive than 10 21 kilograms are known or expected to be approximately spherical.
Knowledge of the location of Earth has been shaped by 400 years of telescopic observations, and has expanded radically since the start of the 20th century. Initially, Earth was believed to be the center of the Universe , which consisted only of those planets visible with the naked eye and an outlying sphere of fixed stars . [ 1 ]
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The universe can be viewed as having a hierarchical structure. [2] At the largest scales, the fundamental component of assembly is the galaxy . Galaxies are organized into groups and clusters , often within larger superclusters , that are strung along great filaments between nearly empty voids , forming a web that spans the observable universe.