Tolle Photos Bilder
April 16, 2012 | Bilder
Einige tolle photos Bilder:
One of a Series of Portraits of Miners Waiting to Go to Work on the 4 P.M. to Midnight Shift at the Virginia-Pocahontas Coal Company Mine #4 near Richlands, Virginia 04/1974
Bild von The U.S. National Archives
Original Caption: One of a Series of Portraits of Miners Waiting to Go to Work on the 4 P.M. to Midnight Shift at the Virginia-Pocahontas Coal Company Mine #4 near Richlands, Virginia. The Mines Are Open Around the Clock. Two Shifts Work in Digging and Bringing Out the Coal, the Other Is Involved in Cleanup Operations. The Cleanup Or "Hoot-Owl" Shift Begins at Midnight 04/1974
U.S. National Archives’ Local Identifier: 412-DA-13891
Photographer: Corn, Jack, 1929-
Richlands (Tazewell county, Virginia, United States) inhabited place
Environmental Protection Agency
Persistent URL: arcweb.archives.gov/arc/action/ExternalIdSearch?id=556343
Repository: Still Picture Records Section, Special Media Archives Services Division (NWCS-S), National Archives at College Park, 8601 Adelphi Road, College Park, MD, 20740-6001.
For information about ordering reproductions of photographs held by the Still Picture Unit, visit: www.archives.gov/research/order/still-pictures.html
Reproductions may be ordered via an independent vendor. NARA maintains a list of vendors at www.archives.gov/research/order/vendors-photos-maps-dc.html
Access Restrictions: Unrestricted
Use Restrictions: Unrestricted
All Eyes on Oldest Recorded Supernova
Bild von Smithsonian Institution
Description: This image combines data from four different space telescopes to create a multi-wavelength view of all that remains of the oldest documented example of a supernova, called RCW 86. The Chinese witnessed the event in 185 A.D., documenting a mysterious "guest star" that remained in the sky for eight months. X-ray images from the European Space Agency’s XMM-Newton Observatory and NASA’s Chandra X-ray Observatory are combined to form the blue and green colors in the image. The X-rays show the interstellar gas that has been heated to millions of degrees by the passage of the shock wave from the supernova.
Infrared data from NASA’s Spitzer Space Telescope, as well as NASA’s Wide-Field Infrared Survey Explorer (WISE) are shown in yellow and red, and reveal dust radiating at a temperature of several hundred degrees below zero, warm by comparison to normal dust in our Milky Way galaxy.
By studying the X-ray and infrared data together, astronomers were able to determine that the cause of the explosion witnessed nearly 2,000 years ago was a Type Ia supernova, in which an otherwise-stable white dwarf, or dead star, was pushed beyond the brink of stability when a companion star dumped material onto it. Furthermore, scientists used the data to solve another mystery surrounding the remnant — how it got to be so large in such a short amount of time. By blowing a wind prior to exploding, the white dwarf was able to clear out a huge "cavity," a region of very low-density surrounding the system. The explosion into this cavity was able to expand much faster than it otherwise would have.
This is the first time that this type of cavity has been seen around a white dwarf system prior to explosion. Scientists say the results may have significant implications for theories of white-dwarf binary systems and Type Ia supernovae.
RCW 86 is approximately 8,000 light-years away. At about 85 light-years in diameter, it occupies a region of the sky in the southern constellation of Circinus that is slightly larger than the full moon.
Creator/Photographer: Chandra X-ray Observatory
NASA’s Chandra X-ray Observatory, which was launched and deployed by Space Shuttle Columbia on July 23, 1999, is the most sophisticated X-ray observatory built to date. The mirrors on Chandra are the largest, most precisely shaped and aligned, and smoothest mirrors ever constructed. Chandra is helping scientists better understand the hot, turbulent regions of space and answer fundamental questions about origin, evolution, and destiny of the Universe. The images Chandra makes are twenty-five times sharper than the best previous X-ray telescope. NASA’s Marshall Space Flight Center in Huntsville, Ala., manages the Chandra program for NASA’s Science Mission Directorate in Washington. The Smithsonian Astrophysical Observatory controls Chandra science and flight operations from the Chandra X-ray Center in Cambridge, Massachusetts.
Medium: Chandra telescope x-ray
Image ID: nhsc2011-09b
Persistent URL: chandra.harvard.edu/photo/2011/rcw86/
Repository: Smithsonian Astrophysical Observatory
Gift line: X-ray: NASA/CXC/SAO & ESA; Infared: NASA/JPL-Caltech/B. Williams (NCSU)
Residents by the pool: Miami, Florida
Bild von State Library and Archives of Florida
Local call number: C017592
Title: Residents by the pool: Miami, Florida
Date: January 1953
Photographer: Charles Barron
Physical descrip: 1 photoprint – b&w – 4 x 5 in.
Series Title: Department of Commerce collection
Repository: State Library and Archives of Florida, 500 S. Bronough St., Tallahassee, FL 32399-0250 USA. Contact: 850.245.6700. Archives@dos.state.fl.us
Persistent URL: www.floridamemory.com/items/show/56786
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