Annotary
Sort

High-Mass Stars "Reveal Rate Black Holes, Neutron Stars and Supernovae Evolved in the Cosmos"

www.dailygalaxy.com
The Large Magellenic Cloud embodies a phase of the universe prior to the Milky Way when the largest number of high-mass stars were formed. For this reason, its metallicity - the proportion of its matter made up of chemical elements different from hydrogen and helium, the primordial atoms that gave rise to the first stars - is only half that of the binaries found in the Milky Way, whose metallicity is very close to the Sun's.
Cancel
Sort

Asteroid Gamble

briankoberlein.com
Yesterday the kilometer-wide asteroid 2014 JO25 passed within 1.8 million kilometers of Earth. Although that’s nearly 5 times farther than the Moon, it’s a “near miss” by astronomical standards. If such an asteroid were to strike Earth, it would make a crater more than 10 kilometers wide and spread debris more than 100 kilometers in all directions. That’s large enough to wipe my home city of Rochester NY off the map. Fortunately there was no risk of impact for Rochester or anywhere else on Earth, but what are the odds that a sizable asteroid would strike your home town? 
Cancel
Sort

Leo Minor – the smaller lion

skywiseunlimited.com
There is a constellation called Leo Minor that represents a lesser lion, just north of regular Leo. Johannes Hevelius added it in 1687. He sort of squeezed it in between Leo and the Big Dipper where there was a bit of unoccupied interstitial space. It’s like how Idaho was formed from the leftover region created by forming the surrounding states. And like Idaho, the tourist attractions are cheaper and less crowded.
Cancel
Sort

LHS 1140b, una supertierra potencialmente habitable alrededor de una enana roja cercana | Astronomía | Eureka

danielmarin.naukas.com
Esto es un no parar. Tras Proxima b y los siete planetas de TRAPPIST-1, las estrellas enanas rojas siguen dando sorpresas en cuanto a planetas potencialmente habitables se refiere. El último es LHS 1140b, una supertierra localizada a 41 años luz en la constelación de Cetus alrededor de una estrella con un 15% de la masa del Sol. Y, aunque su periodo de traslación es de apenas 25 días, el nuevo exoplaneta está localizado en la zona habitable de la estrella. Bingo.
Cancel
Sort

La frase más famosa de Carl Sagan no es suya

hipertextual.com
Quien dice que debemos recordar el legado de las personas que han sido de gran ayuda para el progreso de la humanidad puede competir en un campeonato de obviedades, pese a que en muchas ocasiones tampoco está de más insistir en ello. Pero una de las cosas que, por otro lado, más solemos repetir de las mismas son sus frases célebres si alguna escribieron o soltaron por su boca, incluso tratándose de falsas atribuciones. Pues bien, de nuestro añorado Carl Sagan, astrofísico y uno de los mejores divulgadores de la ciencia que el mundo ha tenido el placer de conocer, la frase más famosa es la siguiente: “Estamos hechos de polvo de estrellas”, o más exactamente: “Estamos hechos de materia estelar”.
Cancel
Sort

Legends Of The Cold

briankoberlein.com
From 1645 to 1715 the Sun entered an extended quiet period known as the Maunder minimum. During that time there was almost no observed sunspot activity on the Sun. It was also a period of abnormally cold winters in Europe, known as the Little Ice Age. A similar, but smaller period of solar quiet from 1796 to 1820 (known as the Dalton solar minimum) correlates to the period of Charles Dickens’ childhood, whose books engrained the idea of a “White Christmas” in English society. These events support the idea that sunspot activity could have an effect on global temperatures. But a new look at the Little Ice Age finds that the connection isn’t quite so clear. 
Cancel
Sort

Live Fast, Die Young

briankoberlein.com
The evolution of a galaxy is driven by star formation. Typically a galaxy will enter a period of active star formation in its youth, and then star formation will gradually taper off as the amount of available gas and dust decreases. Since bright blue stars live much shorter lives than small red ones, over time an aging galaxy becomes less active and more populated by red stars. But sometimes this can happen quite quickly, and a recently discovered galaxy demonstrates just how quickly.
Cancel
Sort

Lepus – the hare

skywiseunlimited.com
Lepus is a constellation that represents a hare, which is basically a rabbit with longer legs and ears. It’s located right beneath Orion, dangerously close to being stepped on, and dangerously close to his two dogs.
Cancel
Sort

Crowdsourced Science Finds Four Candidates For Planet 9 - One Universe at a Time

briankoberlein.com
Ever since Pluto was reclassified as a dwarf planet, there have been eight known planets in our solar system. We have found countless smaller bodies, and even several Pluto-like bodies beyond the orbit of Neptune, but nothing that would meet the criteria of being a planet. But recently there has been indirect evidence of a Uranus-sized planet lurking on the outer edge of our solar system, one that just might be lurking in the astronomical data we’ve gathered. 
Cancel
Sort

Millions In Motion

briankoberlein.com
Our Sun is adrift among the stars. As our home star moves through the galaxy, so to do the other stars. This means that the apparent positions of the stars change over time. Because of the great distances of stars this shift is minuscule and difficult to measure. For years we have only been able to measure the motion of a few close stars. But that’s beginning to change. 
Cancel
Sort

Jupiter's Gravity Prevented Impact With a Captive Asteroid For the Past One-Million Years

www.dailygalaxy.com
playing a cosmic game of chicken with giant Jupiter and with about 6,000 other asteroids sharing the giant planet's space, says a report published in the latest issue of Nature. The asteroid, nicknamed Bee-Zed, is the only one in this solar system that's known both to have an opposite, retrograde orbit around the sun while at the same time sharing a planet's orbital space, says researcher and co-author Paul Wiegert of Western Ontario University Physics and Astronomy.
Cancel
Sort

Ralentizando la muerte del Sol

naukas.com
Vamos a morir todos! Tarde o temprano, el universo nos pondrá en el lugar que nos corresponda porque una cosa está clara: al universo le importamos un bledo. Somos un mero accidente en la historia del cosmos. No tenemos más que pensar en la inmensidad del espacio y en las innumerables amenazas que se ciernen sobre nuestras cabezas: impactos de asteroides y cometas, encuentros cercanos con otras estrellas o agujeros negros, colisiones de galaxias, supernovas, GRBs (Gamma Ray Bursts), etc. Algunos de estos terribles eventos pueden tener lugar a intervalos temporales relativamente cortos y otros, en cambio, no tanto. Así, por ejemplo, los impactos de asteroides se producen tanto menos frecuentemente cuanto mayor es el tamaño de los mismos.
Cancel
Sort

Encuentran en la órbita de Marte restos de antiguos mini-planetas

www.astrofisicayfisica.com
El planeta Marte comparte su órbita con un puñado de pequeños asteroides llamados troyanos. Ahora un equipo internacional de astrónomos, empleando el Very Large Telescope instalado en Chile, ha encontrado que la mayoría de estos objetos comparten una composición común: son probablemente los restos de un mini-planeta que fue destruido por una colisión hace mucho tiempo. Los resultados aparece publicados en la Royal Astronomical Society.
Cancel
Sort

Hello, Rock!

briankoberlein.com
One of the questions I’m asked from time to time is whether a funny looking rock someone found is a meteorite. The short answer is no, since meteorites are extremely rare. The not-so-short answer is that it probably isn’t a meteorite, but there are some basic tests you can do yourself. 
Cancel
Sort

Cambios en 67P/Churyumov-Gerasimenko

www.astrofisicayfisica.com
Durante su misión en el cometa 67P/Churyumov-Gerasimenko, Rosetta ha observado todo tipo de cambios: fracturas en expansión, derrumbes de acantilados, enterramiento de formaciones y la aparición de nuevas figuras debido al desplazamiento de material. Las diferencias más notables se observaron antes y después del periodo más activo del cometa, el perihelio, al llegar al punto de su órbita más cercano al Sol. 
Cancel
Sort

ALMA Sees Hydrogen Super-Halos Around Young Spiral Galaxies - One Universe at a Time

briankoberlein.com
Young galaxies are often surrounded by a halo of hydrogen gas. Over time this gas can be pulled inward, where it can feed star production in the galaxy. While we’ve known these halos existed, it has been difficult to determine their size. But new research from the Atacama Large Millimeter/submillimeter Array (ALMA) has found that some galactic halos are surprisingly large. 
Cancel
Sort

Libra – the scales

skywiseunlimited.com
The constellation of Libra represents a set of scales and it is by far the newest of the zodiacal membership. It may seem odd that there is a machine for weighing stuff in the weird line-up of monsters and zoo critters. On the other hand its two brightest stars have my most favorite star names; Zubenelgenubi, and Zubeneschamali, aka alpha and beta Librae.
Cancel
Sort

The Surface of Saturn's Titan is Electrically Charged --"It's a Strange, Electrostatically Sticky World"

www.dailygalaxy.com
"Titan's extreme physical environment requires scientists to think differently about what we've learned of Earth's granular dynamics," said Josef Dufek, with the Georgia Institute of Technology. "Landforms are influenced by forces that aren't intuitive to us because those forces aren't so important on Earth. Titan is a strange, electrostatically sticky world."
Cancel
Sort

Earth-Like Jet-Stream Waves Exist on the Sun --"Acts Like a Vast Magnetized Ocean"

www.dailygalaxy.com
The same kind of large-scale planetary waves that meander through the atmosphere high above Earth's surface may also exist on the Sun, according to a new study led by a scientist at the National Center for Atmospheric Research (NCAR). Just as the large-scale waves that form on Earth, known as Rossby waves, influence local weather patterns, the waves discovered on the Sun may be intimately tied to solar activity, including the formation of sunspots, active regions, and the eruption of solar flares.
Cancel
Sort

Las misteriosas ráfagas rápidas de radio | Astrofísica | La Ciencia de la Mula Francis

francis.naukas.com
En 2007 el astrofísico Duncan Lorimer y un estudiante descubrieron algo misterioso en los datos de archivo del Observatorio Parkes en Australia. En 2001 se observó un suceso que en 5 milisegundos emitió tanta energía como el Sol en un mes. Lo publicó en Science. Desde 2001 se han observado 18 ráfagas rápidas de radio (FRBs por Fast Radio Bursts). En enero se descubrió que una de ellas tenía un origen extragaláctico, una galaxia enana a unos tres mil millones de años luz de distancia. Hay muchas hipótesis sobre su origen, pero la respuesta definitiva es aún un misterio por resolver.
Cancel
Sort

Lupus – the wolf

skywiseunlimited.com
The constellation Lupus is way down south. It was even recognized as the wolf by Claudius Ptolemy a couple of thousand years ago, which is notable because Ptolemy was mostly concerned with the stuff more to the north. On the other hand the stars in this area are near Centaurus and they do in fact easily connect to look like some sort of critter, if you’re clever. So it’s only natural to add it to a map, that way the Centaur has something fun to shoot at with his arrows.
Cancel
Sort

"Discovered!" --Largest Magnetic Fields in the Universe Extending 5-6 Million Light Years

www.dailygalaxy.com
“We discovered the so far largest ordered magnetic fields in the universe, extending over 5-6 million light years”, says Maja Kierdorf from Max Planck Institute Bonn. Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
Cancel
Sort

Lynx – the lynx

skywiseunlimited.com
The constellation Lynx is one of a few that is its own translation. It means “lynx” so no fancy steps are required to explain it. In the late 1600’s Johannes Hevelius named it after the wild cat because those animals have eyesight good enough to see the stars here and humans don’t (true story).
Cancel
Sort

What We Really See

briankoberlein.com
When news of the TRAPPIST-1 system blazed across headlines, one of the common questions I got was what the planets really looked like. After all, if we can discover planets around other stars, we surely must be able to see them. But we can’t. In some ways can barely see the star. But this demonstrates how what we actually observe (and what data is important to astronomers) is very different from the common perception of what astronomers observe.
Cancel
Sort

Un nuevo estudio afirma la presencia de burbujas en los mares de Titán

www.astrofisicayfisica.com
Un reciente estudio financiado por la NASA ha demostrado que los lagos y mares de hidrocarburos de la luna Titán de Saturno pueden estallar ocasionalmente con burbujas.

Para el estudio, los investigadores del Laboratorio de Propulsión a Chorro de la NASA en Pasadena, California, simularon las condiciones superficiales en Titán, descubriendo que cantidades significativas de nitrógeno pueden disolverse en el metano líquido extremadamente frío que llueve desde los cielos y que se recoge en los ríos. Demostraron que los ligeros cambios en la temperatura, la presión del aire o en la composición pueden hacer que el nitrógeno se separe rápidamente de la solución, en un fenómeno similar al que se produce al abrir una botella de gaseosa.
Cancel
Sort

Contactar con alienígenas es complicado

elpaissemanal.elpais.com
UNO DE LOS anhelos de la especie humana, ampliamente difundido en el cine y la literatura, es el del contacto con alguna civilización extraterrestre. Según diferentes fuentes, este hecho ya se ha producido en numerosas ocasiones, le llaman avistamiento ovni o contacto en la tercera fase. El problema es que, si hacemos caso a estos relatos, los extraterrestres, como los seres divinos, tienen la mala costumbre de aparecerse en lugares remotos, a horas extrañas y normalmente ante el menos avispado del pueblo. Con lo fácil que sería para los extraterrestres o para la Virgen aparecerse en medio de la ceremonia de inauguración de unos Juegos Olímpicos, de la entrega de los Oscar o del Festival de Eurovisión, con televisión en directo y retransmisión mundial para que nadie dudara de su existencia.
Cancel
Sort

Una supertierra potencialmente habitable alrededor de la Estrella de Luyten | Astronomía | Eureka

danielmarin.naukas.com
El descubrimiento de Proxima b, el planeta potencialmente habitable más cercano a la Tierra, y, más recientemente, los planetas terrestres localizados en la zona de habitabilidad de TRAPPIST-1 han puesto en primer plano la importancia de la búsqueda de exoplanetas alrededor de enanas rojas, las estrellas más abundantes del Universo. Mientras averiguamos más datos sobre Proxima Centauri y su planeta todo apunta a que nuestra estrella más cercana es una pequeña cascarrabias a la que le gusta emitir frecuentes exabruptos de radiación que son capaces de freír las hipotéticas formas de vida que pudieran encontrarse en Proxima b. Por otro lado, el sistema TRAPPIST-1 es más atractivo, con hasta cuatro planetas telúricos situados en la zona habitable, pero se encuentra relativamente lejos, a 39 años luz. Ahora, a este selecto club de planetas que podrían albergar formas de vida se le suma la Estrella de Luyten, localizada a tan solo 12,4 años luz, lo que la convierte en la segunda estrella más cercana con un mundo rocoso en la zona habitable.
Cancel
Loading...