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ASTROTEOLOGIA-EVANGELIO EN LAS ESTRELLAS: TELESCOPIO MAS GRANDE DEL MUNDO (CHILE) ES UNA «MAQUINA DEL TIEMPO»
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From: BARILOCHENSE6999  (Original message) Sent: 14/08/2021 11:04
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Perseidas

 
 
 
 
 
 
 
Perseidas

Meteoro a la derecha de la Vía Láctea.
Período 17 julio-24 agosto
Fecha máximo 11-13 de agosto
Radiante alfa: 46 delta: +58
Velocidad 59 km/s
Índice poblacional (r) 2,6
Tasa Horaria Cenital (THZ) 100 meteoros/h
Progenitor 109P/Swift-Tuttle

Las perseidas, popularmente conocidas como las lágrimas de San Lorenzo,1​ son una prolífica lluvia de meteoros anual durante los meses de julio y agosto.

Historia[editar]

Las perseidas son también conocidas en los países de tradición católica con el nombre de lágrimas de San Lorenzo2​ porque el 10 de agosto se celebra su santoral. Durante la Edad Media y el Renacimiento, las perseidas tenían lugar la noche en que se le recordaba, de tal manera que se asociaron con las lágrimas que vertió san Lorenzo al ser quemado en una parrilla.

El registro más antiguo que se tiene de la actividad de las perseidas es del año 36 d. C., de los anales históricos chinos donde se cita un pico de meteoros en esas fechas.3​ Pero no fue hasta 1835 cuando el astrónomo belga Adolphe Quetelet muestra que se produce una lluvia de meteoros, de forma cíclica en agosto, con su radiante en Perseo.4

 Características[editar]

Meteorito de 10 mm de tamaño de las Perseidas en tiempo real, tomado el 14 de agosto de 2019 en Berlín.

Si bien las percibimos como estrellas fugaces, se trata de partículas de polvo del tamaño aproximado de un grano de arena que deja el cometa Swift-Tuttle en su órbita alrededor del sol.5​ El efecto luminoso se produce cuando estos granitos atraviesan la atmósfera terrestre, atraídas por nuestro planeta, y se volatilizan. Lo hacen a unos 210.000 kilómetros por hora.

Su período de actividad es largo y se extiende entre el 16 de julio y el 24 de agosto. Su máximo es entre el 11 y el 13 de agosto con tasa horaria zenital (THZ) 100, lo que le convierte en la tercera lluvia más intensa del año (después de las cuadrántidas y las gemínidas), aunque las perséidas son las más populares por ser visibles desde el hemisferio norte durante el verano.

Origen[editar]

A pesar de que deben su nombre a la constelación de Perseo, lo cierto es que poco tienen que ver con ella. Sí, porque el cuerpo progenitor de las Perseidas es el cometa 109P/Swift-Tuttle.5​ Fue descubierto por Lewis Swift y Horace Parnell Tuttle el 19 de julio de 1862, posee un diámetro de 26 kilómetros y su órbita alrededor del Sol tiene un período de 135 años.6

Su última aparición tuvo lugar en 1992, produciéndose en 1993 un pico de actividad con THZ 300. Desde entonces la actividad ha descendido progresivamente hasta el nivel normal de la actualidad.7

En 2009 hubo un paso hacia una corriente de detritos de mayor densidad poblacional, por lo que la THZ fue de 173.


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Si todos los caminos llevan a Roma...
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Famous face on Mars photo was taken by Viking 1 and other important events  in history |Oneindia News - YouTube
 

The James Webb telescope: part alien life detector, part time machine

 

In the lead-up to the launch of the James Webb telescope, we look at the scientific objectives of the most powerful space observatory ever sent into orbit.

Are we alone in the universe? What did the first galaxies formed after the Big Bang look like? How did the planets in our solar system emerge? The James Webb telescope hopes to find answers to these existential questions.

Set to launch on December 22, the James Webb is the product of the combined scientific prowess of NASA, the European Space Agency (ESA) and the Canadian Space Agency (CSA) – and by extension, Université de Montréal (UdeM). The CSA contributed a scientific instrument and a guidance sensor to the massive observatory and René Doyon, Director of UdeM’s Institute for Research on Exoplanets (iREx) and a professor in the Physics Department, is the principal investigator on the Canadian scientific team.

Together, the components supplied by the CSA, NASA and the ESA form the most complex, accurate and powerful space observatory ever built, one that promises revolutionary discoveries in astronomy.

The unparalleled power of the observatory will help scientists throughout the world scrutinize the distant reaches of the universe to learn more about the composition and inhabitability of exoplanets and study the life cycle of stars.

Exploring new worlds in search of life

The James Webb Telescope is the successor to the Hubble space telescope but is more precise and efficient because of the size of its mirror, the range of light it can detect and its location.

These attributes will enable the Webb to study the planets in our solar system and other planetary systems in unprecedented detail. Moreover, the scientific instrument developed by Doyon’s team is designed to analyze many types of celestial bodies, including the atmospheric composition of distant exoplanets.

“What we’re looking for, our holy grail, are ‘biosignatures,’ that is, signs of extraterrestrial life,” explained iREx coordinator Nathalie Ouellette, an astrophysicist who does communications for the James Webb.

She hastened to add that we shouldn’t imagine these signs of life the way they are depicted in science fiction films: “We’re talking about finding signs of biological activity or the signature of certain molecules that we have identified as essential to life, such as oxygen, water vapour, carbon dioxide, methane and ozone. Based on the presence of such molecules, particularly in certain combinations, we may be able to determine that conditions are conducive to the development of life when we explore an exoplanet using the telescope.”

Casting light on the dawn of the universe

Telescopes are also time machines of a sort. “Looking into space is like looking into the past,” said Ouellette. “Light waves travel so fast that, to the naked eye, they seem to flash instantly from one point to another. In space, however, the distances are so vast that the time it takes light to travel is perceptible.”

That makes the Webb a marvellous time machine. It will be able to see back in time to 200 million years after the Big Bang, something that has never been done before. “With the Hubble, we could go to 500 million years after the Big Bang, so now we’re going 300 million years further,” noted Ouellette. “That’s remarkable, considering that the beginning of the universe was a tumultuous period. Galaxies were colliding and stars were forming at a rapid pace.”

“Tell me where you come from and I’ll tell you who you are”

The Webb will thus improve our understanding of the development of the first luminous objects (galaxies) over time. Ouellette believes the telescope will also provide insight into the creation of our own solar system.

“We still have many questions about the origins of life in our solar system. We don’t know exactly how we came to be on Earth and how the planets were formed,” Ouellette pointed out. “By studying other systems, stars and planets at various stages of development, we hope to be able to trace our own history and understand ourselves better.”

That is the ultimate goal of the James Webb: to revolutionize our understanding of the universe and, above all, to place the Earth, in all its fragility and uniqueness, in a broader context.

https://nouvelles.umontreal.ca/en/article/2021/12/09/the-james-webb-telescope-part-alien-life-detector-part-time-machine/

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From: BARILOCHENSE6999 Sent: 08/10/2024 16:52
35 Easter Eggs We Missed in Famous Movies and TV Shows | Cracked.com

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Decoding The Last Supper Painting Secrets by Da Vinci.


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