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Archive for the ‘space’ Category
New Aluminum-Ice Rocket Propellent Tested
Monday, November 30th, 2009
eldavojohn writes "With the problem of moving conventional rocket fuel to the moon and mars on their minds, researchers from Purdue and Penn State successfully tested and demonstrated the use of aluminum-ice (ALICE) as fuel. In a paper from last August they outlined how it would work [PDF] and now they know it does. Space.com also had more information on the paper and how nano-scale aluminum functions as a fuel."
Herschel Spectroscopy of Future Supernova
Saturday, November 28th, 2009
davecl writes "ESA's Herschel Space Telescope has released its first spectroscopic results. These include observations of VYCMa, a star 50 times as massive as the sun and soon to become a supernova, as well a nearby galaxy, more distant colliding starburst galaxies and a comet in our own solar system. The spectra show more lines than have ever been seen in these objects in the far-infrared and will allow astronomers to work out the detailed chemistry and physics behind star and planet formation as well as the last stages of stellar evolution before VYCMa's eventual collapse into a supernova. More coverage is available at the Herschel Mission Blog, which I run."
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Cassini Captures Saturn’s Northern Lights
Friday, November 27th, 2009
al0ha writes "In the first video showing the auroras above the northern latitudes of Saturn, Cassini has spotted the tallest known 'northern lights' in the solar system, flickering in shape and brightness high above the ringed planet. The new video reveals changes in Saturn's aurora every few minutes, in high resolution, with three dimensions. The images show a previously unseen vertical profile to the auroras, which ripple in the video like tall curtains. These curtains reach more than 1,200 kilometers (750 miles) above the edge of the planet's northern hemisphere."
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Astronomers Invent “Galaxy Game”
Wednesday, November 25th, 2009
Hugh Pickens writes "BBC reports that astronomers have invented a game to help uncover the basis of galactic collisions, showing players images of colliding galaxies and asking them to match those to simulations. These galactic mergers could be the key to why the Universe contains a mixture of different galaxies — some with trailing spiral arms, others more like compact balls of stars. Astronomers say that humans are 'much better than computers' at spotting the patterns and similarities. 'The strength of the game is that it takes results from many people,' says Dr Chris Lintott from Oxford University, one of the members of the Galaxy Zoo team. The developers describe the game as a 'cosmic fruit machine' (i.e., slot machine). The game shows players one real galaxy image and, on command, eight randomly selected simulations pop into the 'slot'" surrounding that image. The aim is for players to choose the simulations that look most similar to the real galaxy and take those through to the next round to examine them further. The simulated images show the different aspects of galaxy formation, so as people play, they will generate data that will help astronomers understand these collisions. 'These collisions take millions of years to unfold,' says Anthony Holincheck, a graduate student at George Mason University and another member of the team. 'All we get from the Universe is a single snapshot of each one. [With] simulations, we will be able to watch each cosmic car crash unfold in the computer.'"
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New Theory of Gravity Decouples Space & Time
Tuesday, November 24th, 2009
eldavojohn writes "Petr Horava, a physicist at the University of California in Berkeley, has a new theory about gravity and spacetime. At high energies, it actually snips any ties between space and time, yet at low energies devolves to equivalence with the theory of General Relativity, which binds them together. The theory is gaining popularity with physicists because it fits some observations better than Einstein's or Newton's solutions. It better predicts the movement of the planets (in an idealized case) and has a potential to create the illusion of dark matter. Another physicist calculated that under Horava Gravity, our universe would experience not a Big Bang but a Big Bounce — and the new theory reproduces the ripples from such an event in a way that matches measurements of the cosmic microwave background."
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