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t study mars from orbit and missions on the surface we will gain information about whether local conditions are favorable for habitability and we will also contribute to understanding the global atmosphere of mars said gómez elvira the circulation models of the mars atmosphere are based mainly on observations by orbiters our measurements will provide a way to verify and improve the models for example significant fractions of the martian atmosphere freeze onto the ground as a south polar carbon dioxide ice cap during southern winter and as a north polar carbon dioxide ice cap in northern winter returning to the atmosphere in each hemisphere s spring at curiosity s landing site far from either pole rems will check whether seasonal patterns of changing air pressure fit the existing models for effects of the coming and going of polar carbon dioxide ice the sensor for air pressure developed for rems by the finnish meteorological institute uses a dust shielded opening on curiosity s deck the most conspicuous components of the weather station are two fingers extending horizontally from partway up the rover s remote sensing mast each of these two rems mini booms holds three electronic sensors for detecting air movement in three dimensions placement of the booms at an angle of 120 degrees from each other enables calculating the velocity of wind without worrying about the main mast blocking the wind one mini boom also holds the humidity sensor the other a set of directional infrared sensors for measuring ground temperature to develop rems and prepare for analyzing the data it will provide spain has assembled a team of about 40 researchers engineers and scientists the team plans to post daily mars weather reports online posted by at 2 12 am no comments monday november 29 2010 astronomers probe sandbar between islands of galaxies this diagram shows an unusual galaxy with bent jets see inset full image and caption see diagram astronomers have caught sight of an unusual galaxy that has illuminated new details about a celestial sandbar connecting two massive islands of galaxies the research was conducted in part with nasa s spitzer space telescope these sandbars or filaments are known to span vast distances between galaxy clusters and form a lattice like structure known as the cosmic web though immense these filaments are difficult to see and study in detail two years ago spitzer s infrared eyes revealed that one such intergalactic filament containing star forming galaxies ran between the galaxy clusters called abell 1763 and abell 1770 now these observations have been bolstered by the discovery inside this same filament of a galaxy that has a rare boomerang shape and unusual light emissions hot gas is sweeping the wandering galaxy into this shape as it passes through the filament presenting a new way to gauge the filament s particle density researchers hope that other such galaxies with oddly curved profiles could serve as signposts for the faint threads which in turn signify regions ripe for forming stars these filaments are integral to the evolution of galaxy clusters among the biggest gravitationally bound objects in the universe as well as the creation of new generations of stars said louise edwards a postdoctoral researcher at the california institute of technology in pasadena and lead author of a study detailing the findings in the dec 1 issue of the astrophysical journal letters her collaborators are dario fadda also at caltech and dave frayer from the national science foundation s national radio astronomy observatory based in charlottesville virginia blowing in the cosmic breeze astronomers spotted the bent galaxy about 11 million light years away from the center of the galaxy cluster abell 1763 during follow up observations with the wiyn observatory near tucson ariz and radio wave observations by the very large array near socorro n m the wiyn observatory is named after the consortium that owns and operates it which includes the university of wisconsin indiana university yale university and the national optical astronomy observatories the galaxy has an unusual ratio of radio to infrared light as measured by the very large array and spitzer making it stand out like a beacon this is due in part to the galaxy having twin jets of material spewing in opposite directions from a supermassive black hole at its center these jets have puffed out into giant lobes of material that emit a tremendous amount of radio waves edwards and her colleagues noticed that these lobes appear to be bent back and away from the galaxy s trajectory through the filament this bow shape the astronomers reasoned is due to particles in the filament pushing on the gas and dust in the lobes by measuring the angle of the arced lobes edwards team calculated the pressure exerted by the filaments particles and then determined the density of the medium the method is somewhat like looking at streamers on a kite soaring overhead to judge the wind strength and the thickness of the air according to the data the density inside this filament is indeed about 100 times the average density of the universe this value agrees with that obtained in a previous x ray study of filaments and also nicely matches predictions of supercomputer simulations interconnected superclusters galaxies tend to bunch together as great islands in the void of space called galaxy clusters these galaxy groupings themselves often keep company with other clusters in superclusters that loom as gargantuan gravitationally associated walls of galaxies these structures evolved from denser patches of material as the universe rapidly expanded after the big bang some 13 7 billion years ago the clumps and threads of this primordial matter eventually cooled and some of it has condensed into the galaxies we see today the leftover gas is strewn in filaments between galaxy clusters much of it is still quite hot about one million degrees celsius 1 8 million degrees fahrenheit and blazes in high energy x rays that permeate galaxy clusters filaments are therefore best detected in x ray light and one direct density reading of the strands has previously been obtained in this band of frequencies but the x ray emitting gas in filaments is much more diffuse and weak than in clusters just as submerged sandbars are extremely hard to spot at sea compared to islands poking above the water therefore obtaining quality observations of filaments is time consuming with current space observatories the technique by edwards and her colleagues which uses radio frequencies that can reach a host of ground based telescopes points to an easier way to probe the interiors of galaxy cluster filaments instead of laboring to find subtle x rays clues astronomers could trust these arced lighthouse galaxies to indicate just where cosmic filaments lie knowing how much material these filaments contain and how they interact with galaxy clusters will be very important for understanding the overall evolution of the universe edwards said the spitzer observations were made before it ran out of its liquid coolant in may 2009 and began its warm mission nasa s jet propulsion laboratory pasadena calif manages the spitzer space telescope mission for nasa s science mission directorate washington science operations are conducted at the spitzer science center at caltech also in pasadena caltech manages jpl for nasa for more information about spitzer visit http spitzer caltech edu and http www nasa gov spitzer posted by at 2 01 am no comments monday november 22 2010 nasa funds high school student robotics program nasa funds a nationwide high school robotics competition that provides students the opportunity to engage with engineers and technology experts for hands on realistic exposure to engineering and technical professions nasa is providing up to 20 million over the next five years to support a national program to inspire student interest in science technology and mathematics with a focus on robotic technology the funding is part of a cooperative agreement with the foundation for inspiration and recognition of science and technology first a nonprofit organization in manchester n h first provides students the opportunity to engage with government industry and university experts including those at nasa s jet propulsion laboratory pasadena calif for hands on realistic exposure to engineering and technical professions this is the largest nasa funded student program geared toward robotics activities said nasa administrator charles bolden for the next five years approximately 25 000 students across the country will not only learn from our nation s best and brightest but also compete and have fun at the same time read the full story view my last 3 blog postings saturn then and now 30 years since voyager visit cassini sees saturn on a cosmic dimmer switch nasa study shows role of melt in arctic sea ice lo business process outsourcing migration services australia bookkeeping services australia posted by at 8 45 pm no comments friday november 12 2010 saturn then and now 30 years since voyager visit ed stone project scientist for nasa s voyager mission remembers the first time he saw the kinks in one of saturn s narrowest rings it was the day the voyager 1 spacecraft made its closest approach to the giant ringed planet 30 years ago scientists were gathering in front of television monitors and in one another s offices every day during this heady period to pore over the bewildering images and other data streaming down to nasa s jet propulsion laboratory in pasadena calif stone drew a crude sketch of this scalloped multi stranded ring known as the f ring in his notebook but with no explanation next to it the innumerable particles comprising the broad rings are in near circular orbits about saturn so it was a surprise to find that the f ring discovered just a year before by nasa s pioneer 11 spacecraft had clumps and wayward kinks what could have created such a pattern it was clear voyager was showing us something different at saturn said stone now based at the california institute of technology in pasadena over and over the spacecraft revealed so many unexpected things that it often took days months and even years to figure them out the f ring curiosity was only one of many strange phenomena discovered in the voyager close encounters with saturn which occurred on nov 12 1980 for voyager 1 and aug 25 1981 for voyager 2 the voyager encounters were responsible for finding six small moons and revealing the half young half old terrain of enceladus that had to point to some kind of geological activity images from the two encounters also exposed individual storms roiling the planet s atmosphere which did not show up at all in data from earth based telescopes scientists used voyager data to resolve a debate about whether titan had a thick or thin atmosphere finding that titan was shrouded in a thick haze of hydrocarbons in a nitrogen rich atmosphere the finding led scientists to predict there could be seas of liquid methane and ethane on titan s surface when i look back i realize how little we actually knew about the solar system before voyager stone added we discovered things we didn t know were there to be discovered time after time in fact the voyager encounters sparked so many new questions that another spacecraft nasa s cassini was sent to probe those mysteries while voyager 1 got to within about 126 000 kilometers 78 300 miles above saturn s cloud tops and voyager 2 approached as close as about 100 800 kilometers 62 600 miles cassini has dipped to this altitude and somewhat lower in its orbits around saturn since 2004 because of cassini s extended journey around saturn scientists have found explanations for many of the mysteries first seen by voyager cassini has uncovered a mechanism to explain the new terrain on enceladus tiger stripe fissures with jets of water vapor and organic particles it revealed that titan indeed does have stable lakes of liquid hydrocarbons on its surface and showed just how similar to earth that moon really is data from cassini have also resolved how two small moons discovered by voyager prometheus and pandora tug on the f ring to create its kinked shape and wakes that form snowballs cassini is indebted to voyager for its many fascinating discoveries and for paving the way for cassini said linda spilker cassini project scientist at jpl who started her career working on voyager from 1977 to 1989 on cassini we still compare our data to voyager s and proudly build on voyager s heritage but voyager left a few mysteries that cassini has not yet solved for instance scientists first spotted a hexagonal weather pattern when they stitched together voyager images of saturn s north pole cassini has obtained higher resolution pictures of the hexagon which tells scientists it s a remarkably stable wave in one of the jet streams that remains 30 years later but scientists are still not sure what forces maintain the hexagon even more perplexing are the somewhat wedge shaped transient clouds of tiny particles that voyager discovered orbiting in saturn s b ring scientists dubbed them spokes because they looked like bicycle spokes cassini scientists have been searching for them since the spacecraft first arrived as saturn approached equinox and the sun s light hit the rings edge on the spokes did reappear in the outer part of saturn s b ring but cassini scientists are still testing their theories of what might be causing these odd features the fact that we still have mysteries today goes to show how much we still have to learn about our solar system said suzanne dodd voyager s project manager based at jpl today the voyager spacecraft continue as pioneers traveling toward the edge of our solar system we can t wait for the voyager spacecraft to enter interstellar space true outer space and make more unexpected discoveries voyager 1 which was launched on sept 5 1977 is currently about 17 billion kilometers 11 billion miles away from the sun it is the most distant spacecraft voyager 2 which was launched on aug 20 1977 is currently about 14 billion kilometers 9 billion miles away from the sun the voyagers were built by jpl which continues to operate both spacecraft caltech manages jpl for nasa the cassini huygens mission is a cooperative project of nasa the european space agency and the italian space agency jpl manages cassini for nasa the cassini orbiter and its two onboard cameras were designed developed and assembled at jpl more voyager information is available at http www nasa gov voyager and http voyager jpl nasa gov more cassini information is available at http www nasa gov cassini and http saturn jpl nasa gov posted by at 2 22 am no comments older posts home subscribe to posts atom bloggapedia followers daily update blog markwadsworth thelasttradition reducefootprints alwaysonwatch2 zencomix musingsofavastright winger hackwilson 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