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Humans have been gazing at stars and other objects in the night sky for thousands of years, as is evident in the naming of many constellations, notably the largely Greek names used today. Hans Lippershey , a German-Dutch spectacle maker, is commonly credited as being the first to invent the optical telescope .
2005 – First light at SALT, the largest optical telescope in the Southern Hemisphere, with a hexagonal primary mirror of 11.1 by 9.8 meters. 2007 – First light at Gran Telescopio de Canarias (GTC), in Spain, the largest optical telescope in the world with an effective diameter of 10.4 meters.
c. 16th century BCE – Mesopotamian cosmology has a flat, circular Earth enclosed in a cosmic ocean. [1]c. 15th–11th century BCE – The Rigveda of Hinduism has some cosmological hymns, particularly in the late book 10, notably the Nasadiya Sukta which describes the origin of the universe, originating from the monistic Hiranyagarbha or "Golden Egg".
So if the matter that originally emitted the oldest CMBR photons has a present distance of 46 billion light-years, then the distance would have been only about 42 million light-years at the time of decoupling. The light-travel distance to the edge of the observable universe is the age of the universe times the speed of light, 13.8 billion light ...
Following the trajectory of free falling objects, the Earth is "below" us and the sky is "above" us. Characterization of the terrestrial surface, in four main types of terrain: lands covered with vegetation; dry deserts; bodies of liquid water, both salted (seas and oceans) and fresh (rivers and lakes); and frozen landscapes (glaciars, polar ...
Astronomical chronology, or astronomical dating, is a technical method of dating events or artifacts that are associated with astronomical phenomena.Written records of historical events that include descriptions of astronomical phenomena have done much to clarify the chronology of the Ancient Near East; works of art which depict the configuration of the stars and planets and buildings which ...
He said that some objects in the belt can come close enough to Earth and at velocities low enough (roughly 2.8 million miles away and 2,200 miles per hour) to allow them to temporarily orbit Earth.
1989 – Margaret Geller and John Huchra discover the "Great Wall", a sheet of galaxies more than 500 million light years long and 200 million wide, but only 15 million light years thick. 1990 – Michael Rowan-Robinson and Tom Broadhurst discover that the IRAS galaxy IRAS F10214+4724 is the brightest known object in the Universe.