Está de moda un email titulado “dos lunas en el cielo”, que habla de los cálculos de un planetario internacional, determinando que para el 27 de agosto del 2009 Marte se verá grande y brillante como la Luna. No es complicado ver qué tan falsa es la noticia, con aritmética básica.
Phoenix Lander Team: It Snows at Night on Mars | Universe Today - 0 views
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Phoenix landed at the north arctic region on Mars (68.22°N, 234.25°E) on May 25th, 2008. On Mars, this was just before the summer solstice. Phoenix operated for 5 months, and was able to observe conditions as the seasons changed from summer to winter, giving science teams an unprecedented look at the planet's changing weather patterns, including frost and precipitation.
Ciencia para leer en Periódico - 0 views
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Recuerdo la primera vez que vi a Marte en el telescopio, fue genial ver este planeta, aunque con todo y aumento no dejaba de ser un punto redondo anaranjado en el campo óptico. Ver planetas del sistema solar a través de un telescopio no es una experiencia común para la mayoría de la gente. Además todos estamos acostumbrados a las hermosas y enormes imágenes que nos muestran a diario los medios de masivos y con las cuales construimos nuestros imaginarios. Es entendible pues, que el "ciudadano de a pie" crea en cualquier información que le llegue a su correo. El ejercicio de la divulgación científica es complejo, sobre todo cuando se compite con la desinformación causada por los grandes medios de comunicación.
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Guest Post: Evalyn Gates on Cosmic Magnification (or - Invasion of the Giant Blue Space... - 0 views
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This is not just a pretty picture, however – the image packs a lot of scientific information. The authors extract the mass distribution in the cluster (which has implications for cosmological models), measure the mass-to-light ratio of the bright galaxy in the center of the cluster, and use the magnifying power of the lens to search for even more distant galaxies. The basic idea is to construct a model of the lens, starting with the cluster galaxies and a dark matter halo; then refine the model to reproduce the multiple images that are seen. Using this refined model it’s possible to predict the location of additional images of a given source, and to identify regions of high magnification that can then be examined for multiple images of other sources. Any additional images that are found can be used to further refine the model and so on.
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This galaxy has been lensed by the warp in spacetime created by the cluster. Light from the galaxy, which lies almost directly behind the center of the cluster but much farther away from us, travels along several curved paths through the cluster lens, producing multiple magnified images of the galaxy. The inset box shows a computer generated model of the unlensed source galaxy, enlarged by a factor of four so that the details, including the spiral arm structure, are visible. Without the lensing power of the cluster, we would see this galaxy as a single small blue smudge. In general, lensing will both magnify and distort (shear) images of a background source. This lens is fairly unique in that we see large but relatively intact images of the spiral galaxy, which implies that the mass distribution in the central region of the cluster must be nearly uniform.
Integral satellite disproves dark matter origin for mystery radiation - 0 views
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More holes in the dark matter hypotheses
Jupiter gets another cosmic punch, shows new bruise - Ars Technica - 0 views
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Over the weekend, Jupiter was apparently struck by an unknown object, probably a comet or an asteroid. The discovery was made by Anthony Wesley in Australia, an amateur astronomer well-known in both the amateur and professional astronomy communities.
Spitzer Telescope Images Incredible NGC 1097 Galaxy - 0 views
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NASA's Spitzer Space Telescope has imaged a wild creature of the dark -- a coiled galaxy with an eye-like object at its center.
ESO - ESO 24/09 - Astronomer's new guide to the galaxy: largest map of cold dust revealed - 0 views
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This new guide for astronomers, known as the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) shows the Milky Way in submillimetre-wavelength light (between infrared light and radio waves [1]). Images of the cosmos at these wavelengths are vital for studying the birthplaces of new stars and the structure of the crowded galactic core.
Study plunges standard Theory of Cosmology into Crisis - 0 views
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As modern cosmologists rely more and more on the ominous "dark matter" to explain otherwise inexplicable observations, much effort has gone into the detection of this mysterious substance in the last two decades, yet no direct proof could be found that it actually exists. Even if it does exist, dark matter would be unable to reconcile all the current discrepancies between actual measurements and predictions based on theoretical models. Hence the number of physicists questioning the existence of dark matter has been increasing for some time now.
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