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Un exquisito mapamundi a doble página, iluminado en rojo, azul, verde, siena y oro, representa el mundo conocido y refleja el estado del conocimiento geográfico en España y Portugal en ese momento. La línea de demarcación entre los dominios de España y Portugal, establecida en 1494 en el Tratado de Tordesillas, tiene un lugar destacado en ...
Cosmos Redshift 7 (also known as COSMOS Redshift 7, Galaxy Cosmos Redshift 7, Galaxy CR7 or CR7) is a high-redshift Lyman-alpha emitter galaxy. At a redshift z = 6.6, [ 1 ] the galaxy is observed as it was about 800 million years after the Big Bang , during the epoch of reionisation . [ 1 ]
Encyclopedia Galactica is the name of a number of fictional or hypothetical encyclopedias containing all the knowledge accumulated by a galaxy-spanning civilization, most notably in Isaac Asimov's Foundation series. The concept of a "future encyclopedia" has become "something iconic among many lovers of the science fiction", and has been reused ...
A compendium may concisely summarize a larger work. In most cases, the body of knowledge will concern a specific field of human interest or endeavour (for example: hydrogeology , logology , ichthyology , phytosociology or myrmecology ), while a general encyclopedia can be referred to as a compendium of all human knowledge .
A diagram in Byzantine astronomer Johannes Kamateros's 12th century Compendium of Astrology shows the Sun represented by the circle with a ray, Jupiter by the letter Zeta (the initial of Zeus, Jupiter's counterpart in Greek mythology), Mars by a shield crossed by a spear, and the remaining classical planets by symbols resembling the modern ones ...
NGC 4731 is a barred spiral galaxy located near the Virgo Supercluster. To its celestial south lies NGC 4731A, a small irregular galaxy. [2] Both galaxies feature high concentrations of neutral HI gas. [3] It is theorized that its elongated arm structure could be related to gravitational interactions with a nearby galaxy, NGC 4967.
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NGC 4151 is an intermediate spiral Seyfert galaxy with weak inner ring structure located 15.8 megaparsecs (52 million light-years) from Earth [4] in the constellation Canes Venatici. The galaxy was first mentioned by William Herschel on March 17, 1787; it was one of the six Seyfert galaxies described in the paper [ 5 ] which defined the term.