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@nasa : Martian Sunset! The sun dips to a Martian horizon in a blue-tinged sky in images sent home to Earth this week from our Curiosity Mars rover. Curiosity used its Mast Camera (Mastcam) to record the sunset during an evening of skywatching on April 15, 2015. The imaging was done between dust storms, but some dust remained suspended high in the atmosphere. The sunset observations help researchers assess the vertical distribution of dust in the atmosphere. "The colors come from the fact that the very fine dust is the right size so that blue light penetrates the atmosphere slightly more efficiently," said Mark Lemmon of Texas A&M University, College Station, the Curiosity science-team member who planned the observations. "When the blue light scatters off the dust, it stays closer to the direction of the sun than light of other colors does. The rest of the sky is yellow to orange, as yellow and red light scatter all over the sky instead of being absorbed or staying close to the sun." Image Credit: NASA/JPL-Caltech/MSSS #nasa #mars #sunset #curiosityrover #curiosity #science @nasajpl
โพสต์เมื่อ 11 พ.ค. 2558 | 23:17 น.

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Happy Mother's Day! Send your mom this interstellar 'rose, seen here by our Spitzer Space Telescope. These bright young stars are found in a rosebud-shaped (and rose-colored) nebulosity known as NGC 7129. The star cluster and its associated nebula are located at a distance of 3300 light-years in the constellation Cepheus. The stars formed from a massive cloud of gas and dust that contains enough raw materials to create a thousand Sun-like stars. In a process that astronomers still poorly understand, fragments of this molecular cloud became so cold and dense that they collapsed into stars. Most stars in our Milky Way galaxy are thought to form in such clusters. Image Credit: NASA/JPL/Caltech/Harvard-Smithsonian CfA #mothersday #moms #mom #flowers #mom #nasa #spitzer #space #science;
This image provides the clearest ever view of galaxy NGC 949, which lies over 30 million light-years away in the constellation of Triangulum. The galaxy has an unusual shape, made more obscure due to its inclination. From our point of view, it is difficult to discern exactly what type of galaxy NGC 949 is, but it is certainly a disk galaxy of some kind, most likely a spiral. Taken with Hubble’s Advanced Camera for Surveys (ACS), this image shows extraordinary detail. This detail allows us to see a strange asymmetric alignment in the dark lanes of dust that snake across the galaxy. The top-right half of the galaxy appears considerably more marbled with dust in this image; a curious observation explained by stars tending to favor locations towards the center of a galaxy, and dust preferring almost invariably to reside along the galactic plane. Credit: ESA/Hubble & NASA #hubble #hst #galaxy #nasa #space;
Decades of satellite observations and astronaut photographs show that clouds dominate space-based views of Earth. One study based on nearly a decade of satellite data estimated that about 67 percent of Earth’s surface is typically covered by clouds. This is especially the case over the oceans, where other research shows less than 10 percent of the sky is completely clear of clouds at any one time. Over land, 30 percent of skies are completely cloud free. Earth’s cloudy nature is unmistakable in this global cloud fraction map, based on data collected by the Moderate Resolution Imaging Spectroradiometer (MODIS) on our Aqua satellite. While MODIS collects enough data to make a new global map of cloudiness every day, this version of the map shows an average of all of the satellite’s cloud observations between July 2002 and April 2015. Colors range from dark blue (no clouds) to light blue (some clouds) to white (frequent clouds). Image Credit: NASA Earth Observatory image by Jesse Allen and Kevin Ward, using data provided by the MODIS Atmosphere Science Team, NASA Goddard Space Flight Center #nasa #space #earth #earthrightnow #clouds #oceans #science;
We found evidence that a massive star exploded in a lopsided fashion, sending ejected material flying in one direction and the core of the star in the other. The findings offer the best proof yet that star explosions of this type, called Type II or core-collapse supernovae, are inherently asymmetrical, a phenomenon that had been difficult to prove before now. The still unraveling remains of supernova 1987A are shown here in this image taken by our Hubble Space Telescope. The bright ring consists of material ejected from the dying star before it detonated. The ring is being lit up by the explosion's shock wave. Credits: ESA/Hubble & NASA @nasa #nasabeyond #nustar #supernova #star #hubble #science;
Just how big was yesterday’s solar flare? Well, compare it to the size of Earth. The X2.7 class solar flare flashed on the edge of the sun on May 5, 2015. This image was captured by our Solar Dynamics Observatory and shows a blend of light from different wavelengths. The Earth is shown to scale. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel. Credit: NASA/GSFC/SDO #nasa #nasabeyond #space #sun #sdo #solarflare #science;

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