When our solar system was young, its biggest babies--Jupiter and Saturn--threw tantrums by the trillion. The huge planets hurled ice-covered rocky bodies from the inner solar system far past the orbit of Pluto. Some of those bodies revisit their old neighborhood as "long period" comets, which have been called the Rosetta Stone of the solar system because their pristine composition holds the key to understanding how Earth and similar planets formed. Astrophysicists from the University of Minnesota and the Spitzer Science Center (California Institute of Technology) will present sharp pictures of comets and their dust trails, as well as data on comets chemical composition, taken during the Spitzer Space Telescopes first year of operation during a poster session and press conference Tuesday, Jan. 11, at the American Astronomical Society meeting in San Diego.
Unlike the Hubble Space Telescope, Spitzer does not oribt Earth; instead, it travels behind the Earth in the same orbital path. It operates at infrared wavelengths, which enables it to see objects and material too cold to emit visible light. This is possible because even cold objects radiate heat to their surroundings as long as the surroundings are even colder. That heat is given off as infrared radiation; the cooler the object, the longer the wavelength of infrared light it emits.
The astrophysicists who will present the studies are Robert Gehrz, a University of Minnesota astronomy professor and key member of the team that focused Spitzer in orbit; Charles "Chick" Woodward and Michael Kelley, astronomy professor and graduate student, respectively, at the university; and William T. Reach of the Spitzer Science Center at the California Institute of Technology.
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22.02.2017 | NASA/Goddard Space Flight Center
Tune your radio: galaxies sing while forming stars
21.02.2017 | Max-Planck-Institut für Radioastronomie
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
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