Thursday, July 29

sol

Espacio, luz de las estrellas, Noticias, polvo de estrellas, Sistema Solar, sol, tierra, universo

The light of the stars, key in the origin of the Earth | Digital Trends Spanish

In 2011, scientists discovered that solar wind samples brought to Earth by the Genesis mission showed that oxygen isotopes in the Sun differ from those found on our planet, the Moon, and the other planets and satellites in the solar system. According to experts, at the beginning of the history of the solar system, the material that would later become planets received a strong dose of ultraviolet light, this could explain the difference. At that time, when wondering where it came from, two theories emerged. One of them pointed out that the ultraviolet light came from our then young sun, or from a nearby large star in the so-called solar stellar nursery. Now researchers at Washington University in St. Louis have determined that the second hypothesis was most likely. "We knew we were born...
EEI, Espacio, estacion espacial internacional, ISS, NASA, Noticias, sol

This is what the ISS looks like passing just in front of the Sun | Digital Trends Spanish

We are used to the fact that the photographs we see of the International Space Station (ISS) are always spectacular. A couple of weeks ago, we were surprised by the image of astronaut Thomas Pesquet that shows how fast the ISS is moving. Now we have seen another impressive postcard, this time taken from Earth. The record corresponds to NASA photographer Joel Kowsky, who managed to take a beautiful sequence of images where you can see the transit of the International Space Station just in front of the Sun. Subsequently, the professional decided to combine the entire sequence in a single photograph, which allows a better appreciation of how the station moves. NASA / Joel KowskyWhat Kowsky did is not an easy task, since the ISS travels at a speed of 8 kilometers per second; the most dif...
epidemia, gripe, Salud, sol, Tendencias, virus

The role of the Sun in the transmission of respiratory diseases | Digital Trends Spanish

Why do most respiratory viral diseases spread cyclically in autumn and winter in temperate regions of the world? An interdisciplinary team from the Italian National Institute of Astrophysics, the University of Milan, Lombardy's regional agency for the environment, and the Don Gnocchi Foundation, claim that the answer is closely related to the Sun. The researchers developed a theoretical model that shows that both the prevalence and the evolution of epidemics are strongly correlated with the amount of daily solar irradiation that reaches a certain place on Earth at a certain time of year. “Our model offers a simple answer to an important scientific question, still unresolved. Why do many viral respiratory epidemics, such as influenza, develop cyclically during the fall and winter o...
aire libre, Alimentación, altas dosis, calcio, cuarentena, encierro, luz solar, niveles, Noticias, Salud, sol, suplementos, vitamina, Vitamina D

High-dose vitamin D supplements would be unnecessary | Digital Trends Spanish

People get vitamin D from exposure to sunlight. We can also nourish ourselves with it through some foods, this constitutes only a small portion of the supply we need. For the same reason, many people seek to increase their intake of this vitamin through supplements, especially in a period where we have not been able to spend so much time outside exposed to sunlight due to sanitary restrictions. However, an article published on the site EurekAlert by the Federal Institute for Risk Assessment (BfR), explains that the consumption of these food supplements in high doses is unnecessary. In fact, such an overdose could lead to high levels of calcium in the blood (hypercalcemia). In humans, this is associated with fatigue, muscle weakness, constipation, vomiting, and can even cause card...
Enanas Blancas, Espacio, Exoplanetas, Noticias, Sistema Solar, sol

They discover the first planet that survived the death of its sun | Digital Trends Spanish

A consortium of astronomers discovered the first giant exoplanet that was able to survive the death of its sun and continue to orbit the white dwarf that its parent star became. The finding from the Association of Research Universities in Astronomy (Aura) shows that it is possible for planets the size of Jupiter to survive the disappearance of their star and settle into close orbits around the remaining stele, close to the habitable zone. The research also predicts what could happen in the Solar System, when the Sun ages and becomes a white dwarf. Astronomers used the Gemini International Observatory, a program of NOIRLab, among other telescopes in the world and in space, to find and characterize a giant planet, 13.8 times larger than Jupiter, orbiting a white dwarf star. This is t...
ciclo solar, Espacio, Estados Unidos, luna, NASA, Noticias, sol

A new solar cycle began, NASA explains what it means | Digital Trends Spanish

This Tuesday solar cycle number 25 began that will last eleven years and will be a new phase in the polarity of the Sun, which will determine variations in space weather, according to what is indicated by the National Aeronautics and Space Administration (NASA). According to scientists from the agency together with officials from the National Oceanic and Atmospheric Administration (NOAA), our star has already been in this new stage for nine months and it is estimated that this new cycle will be similar to the previous one, developed between 2008 and 2019 and that, according to the experts, it was pretty quiet. In any case, this does not mean that it is "risk-free", they say. According to what they point out, the solar cycle affects the activity on the surface of the Sun...
Espacio, Noticias, Sistema Solar, sol, universidad de harvard

Did the Sun have a twin? The theory about the origin of life | Digital Trends Spanish

A new published theory suggests that the Sun may have had a twin of similar mass at some point in history, as part of a binary system in which two stars orbit each other, according to scientists from the Harvard University. According to the researchers, the collection of stars formed next to the Sun from the same dense cloud of molecular gas could explain the Oort Cloud, as it is possible to see it today. The Oort Cloud is on the edge of the Solar System and contains billions of cold objects. Popular theory associates its formation with the debris that remained during the formation of the Solar System, where objects were scattered over great distances. However, a binary system could be the missing piece to the puzzle. According to researcher Amir Siraj, it should come as no surpr...