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Welcome
Scientists at DTM bring the perspective of several disciplines to broad
questions about nature. DTM's name comes from its original role to
chart the Earth's magnetic field. This goal was largely accomplished by
1929. Since then, DTM has evolved to reflect the growing multi-
disciplinary nature of the Earth, planetary, and astronomical sciences.
Today, the historic goal remains-to understand the physical Earth and
the universe that is our home.
The above image is a map tracing the voyages that the Carnegie and the Galilee research vessels undertook, beginning in 1905.
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Monday, 28 January 2008 |
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Vera C. Rubin Fellow Alceste Bonanos and Hubble Fellow Mercedes López-Morales and collaborators have discovered the origin of a young star speeding away from the Milky Way. On the basis of its age and distance traveled, it could not have come from our galaxy. Rather, the group determined that the star came from our neighboring galaxy, the Large Magellanic Cloud (LMC), a result suggesting that the star was ejected from a yet-to-be-observed massive black hole. The research will be published in an upcoming issue of Astrophysical Journal Letters.
The star, HE 0437-5439, is a young early type star, and one of ten so-called hypervelocity stars found so far, speeding through our galaxy. “But this one is different from the other nine,” López-Morales commented. “Their type, speed, and age make them consistent with having been ejected from the center of our galaxy, where we know there is a super-massive black hole. This star, discovered in 2005, initially appeared to have an elemental makeup like our Sun’s, suggesting that it, too, came from the center of our galaxy. But that didn’t make sense because it would have taken 100 million years to get to its current location, and HE 0437-5439 is only 35 million years old.”
For more information, see the CIW Press Release or Space.com article.
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Monday, 28 January 2008 |
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Jessica Warren joined DTM as a Carnegie Fellow this January. She earned her Ph.D. in geochemistry from the Massachusetts Institute of Technology and Woods Hole Oceanographic Institution Joint Program in Oceanography and Applied Ocean Science and Engineering in August 2007. In her thesis, she investigated compositional and rheological constraints on the dynamics of the oceanic upper mantle. From detailed isotopic and chemical analyses of abyssal peridotites, she demonstrated that the mantle is compositionally heterogeneous at all length scales. Using the electron backscatter diffraction (EBSD) technique, Warren examined the relationship between olivine orientation and shear strain in order to improve the framework for interpretation of seismic anisotropy.
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Read more...
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Tuesday, 15 January 2008 |
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MESSENGER flew within 200 km (124 miles) of the surface of Mercury yesterday in the first of three flybys of the planet. Initial radio signals from the spacecraft indicate that it is operating normally. The first scientific data return from the flyby was received today, just minutes before the closest approach to the planet, as planned. Tomorrow at 12:00 p.m. EST, the spacecraft will turn back towards Earth to start down-linking the on-board stored data that include images; spectral observation of the surface, atmosphere, and tail; a surface topographic profile; and magnetometer and charged particle measurements of Mercury's magnetosphere. For more information, see the MESSENGER Web site.
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