The International Space Station. Credit: NASA
Monday, September 30, 2013
Sunday, September 29, 2013
HOT GAS ARMS IN COMA CLUSTER OF GALAXIES
Clues to the Growth of the Colossus in Coma
A team of astronomers has discovered enormous arms of hot gas in the Coma cluster of galaxies by using NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton. These features, which span at least half a million light years, provide insight into how the Coma cluster has grown through mergers of smaller groups and clusters of galaxies to become one of the largest structures in the universe held together by gravity.
A new composite image, with Chandra data in pink and optical data from the Sloan Digital Sky Survey appearing in white and blue, features these spectacular arms. In this image, the Chandra data have been processed so extra detail can be seen.
The X-ray emission is from multimillion-degree gas and the optical data shows galaxies in the Coma Cluster, which contain only about one-sixth the mass in hot gas. Only the brightest X-ray emission is shown here, to emphasize the arms, but the hot gas is present over the entire field of view.
Researchers think that these arms were most likely formed when smaller galaxy clusters had their gas stripped away by the head wind created by the motion of the cluster through the hot gas, in much the same way that the headwind created by a roller coaster blows the hats off riders.
Coma is an unusual galaxy cluster because it contains not one, but two giant elliptical galaxies near its center. These two giant elliptical galaxies are probably the vestiges from each of the two largest clusters that merged with Coma in the past. The researchers also uncovered other signs of past collisions and mergers in the data.
From their length, and the speed of sound in the hot gas (about four million km/hr), the newly discovered X-ray arms are estimated to be about 300 million years old, and they appear to have a rather smooth shape. This gives researchers some clues about the conditions of the hot gas in Coma. Most theoretical models expect that mergers between clusters like those in Coma will produce strong turbulence, like ocean water that has been churned by many passing ships. Instead, the smooth shape of these lengthy arms points to a rather calm setting for the hot gas in the Coma cluster, even after many mergers.
Large-scale magnetic fields are likely responsible for the small amount of turbulence that is present in Coma. Estimating the amount of turbulence in a galaxy cluster has been a challenging problem for astrophysicists. Researchers have found a range of answers, some of them conflicting, and so observations of other clusters are needed.
Two of the arms appear to be connected to a group of galaxies located about two million light years from the center of Coma. One or both of these arms connects to a larger structure seen in the XMM-Newton data, and spans a distance or at least 1.5 million light years. A very thin tail also appears behind one of the galaxies in Coma. This is probably evidence of gas being stripped from a single galaxy, in addition to the groups or clusters that have merged there.
These new results on the Coma cluster, which incorporate over six days worth of Chandra observing time, will appear in the September 20, 2013, issue of the journal Science. The first author of the paper is Jeremy Sanders from the Max Planck Institute for Extraterrestrial Physics in Garching, Germany. The co-authors are Andy Fabian from Cambridge University in the UK; Eugene Churazov from the Max Planck Institute for Astrophysics in Garching, Germany; Alexander Schekochihin from University of Oxford in the UK; Aurora Simionescu from Stanford University in Stanford, CA; Stephen Walker from Cambridge University in the UK and Norbert Werner from Stanford University in Stanford, CA.
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's science and flight operations from Cambridge, Mass.
Credits: X-ray: NASA/CXC/MPE/J. Sanders et al; Optical: SDSS
Saturday, September 28, 2013
Thursday, September 26, 2013
Wednesday, September 25, 2013
Tuesday, September 24, 2013
NASA PARTNERS WITH INDUSTRY TO FURTHER COMPOSITE MATERIALS RESEARCH
FROM: NASA
NASA Announces Advanced Composite Research Partnership
NASA has selected six companies from five U.S. states to participate in a government-and-industry partnership to advance composite materials research and certification.
The companies are:
• Bell Helicopter Textron Inc. of Fort Worth, Texas
• GE Aviation of Cincinnati
• Lockheed Martin Aeronautics Company of Palmdale, Calif.
• Northrop Grumman Aerospace Systems of Redondo Beach, Calif.
• Boeing Research & Technology of St. Louis
• United Technologies Corporation and subsidiary Pratt & Whitney of Hartford, Conn.
They were selected from 20 proposals submitted by teams from industry and academia in response to a call from the Advanced Composites Project, which is part of NASA's Aeronautics Research Mission Directorate's Integrated Systems Research Program. The project sought proposals to reduce the time for development, verification and regulatory acceptance of new composite materials and structures.
A panel of experts from NASA, the Federal Aviation Administration and the U.S. Air Force Research Laboratory reviewed the submissions and assessed them according to specific criteria. The six firms were chosen for their technical expertise, willingness and ability to share in costs, certification experience with government agencies, focused technology areas and partnership histories.
The first task for the partners is to develop articles of collaboration and establish how the alliance will work and how companies may be added in the future.
NASA Announces Advanced Composite Research Partnership
NASA has selected six companies from five U.S. states to participate in a government-and-industry partnership to advance composite materials research and certification.
The companies are:
• Bell Helicopter Textron Inc. of Fort Worth, Texas
• GE Aviation of Cincinnati
• Lockheed Martin Aeronautics Company of Palmdale, Calif.
• Northrop Grumman Aerospace Systems of Redondo Beach, Calif.
• Boeing Research & Technology of St. Louis
• United Technologies Corporation and subsidiary Pratt & Whitney of Hartford, Conn.
They were selected from 20 proposals submitted by teams from industry and academia in response to a call from the Advanced Composites Project, which is part of NASA's Aeronautics Research Mission Directorate's Integrated Systems Research Program. The project sought proposals to reduce the time for development, verification and regulatory acceptance of new composite materials and structures.
A panel of experts from NASA, the Federal Aviation Administration and the U.S. Air Force Research Laboratory reviewed the submissions and assessed them according to specific criteria. The six firms were chosen for their technical expertise, willingness and ability to share in costs, certification experience with government agencies, focused technology areas and partnership histories.
The first task for the partners is to develop articles of collaboration and establish how the alliance will work and how companies may be added in the future.
Monday, September 23, 2013
Sunday, September 22, 2013
AN ANTARES ROCKET LAUNCHES TO INTERNATIONAL SPACE STATION
FROM: NASA
The Orbital Sciences Corporation Antares rocket, with the Cygnus cargo spacecraft aboard, is seen in this false color infrared image, as it launches from Pad-0A of the Mid-Atlantic Regional Spaceport (MARS), Wednesday, Sept. 18, 2013, NASA Wallops Flight Facility. NASA Wallops Flight Facility, Virginia. Cygnus is on its way to rendezvous with the space station. The spacecraft will deliver about 1,300 pounds (589 kilograms) of cargo, including food and clothing, to the Expedition 37 crew. Image Credit: NASA/Bill Ingalls
Saturday, September 21, 2013
Friday, September 20, 2013
Thursday, September 19, 2013
Wednesday, September 18, 2013
Tuesday, September 17, 2013
Monday, September 16, 2013
Friday, September 13, 2013
Thursday, September 12, 2013
Wednesday, September 11, 2013
Tuesday, September 10, 2013
Monday, September 9, 2013
Sunday, September 8, 2013
THE NEW PLUG-AND-PLAY APPROACH TO BUILDING A SPACECRAFT
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| LADEE Spacecraft. Photo Credit: NASA |
FROM: NASA
On Friday, Sept. 6, NASA is scheduled to launch a small satellite mission, called the Lunar Atmosphere and Dust Environment Explorer (LADEE), which will orbit the moon to gather detailed information about its atmosphere and the role of dust in the lunar sky.
LADEE is the first spacecraft designed, developed, built, integrated and tested at NASA's Ames Research Center in Moffett Field, Calif. Using a Modular Common Spacecraft Bus architecture, also developed by Ames, LADEE will demonstrate how to build a first class spacecraft at reduced cost. The LADEE spacecraft makes use of general purpose spacecraft modules that allow for a plug-and-play approach to manufacturing and assembly. This approach along with commercial off-the-shelf products allows mission designers to develop, assemble and test multiple spacecraft modules at the same time – essentially giving them the versatility to get the biggest bang for NASA's buck.
“LADEE’s common bus is an innovative concept that brings NASA a step closer to multi-use designs and assembly line production, while moving away from custom design,” said Ames Director S. Pete Worden. "This mission will put the common bus design to the test. This same common bus can be used on future missions to explore other destinations, including voyages to orbit and land on the moon, low-Earth orbit, and near-Earth objects."
The space agency has adopted a “more with less” approach to robotic missions. It also is about using NASA’s small satellite missions to test cutting-edge space technologies for rapid development. These technology demonstrations allow NASA the opportunities to test in space emerging science and engineering technologies, and economical commercial off-the-shelf technologies on a smaller scale. These demonstrations also help researchers better understand how hardware will survive the harsh radiation, temperature and vacuum conditions encountered in space. All while being faster, more efficient and less expensive than traditional missions.
Findings could reap untold benefits for science and industry here on Earth. Rapid technology developments will allow future NASA missions to pursue bolder and more sophisticated science, enable safe and rewarding human missions beyond low-Earth orbit and enable entirely new approaches to U.S. space operations.
“NASA is looking for affordable ways to launch often and inexpensively,” said David Korsmeyer, Director of Engineering at NASA Ames. “We can use off-the-shelf components because customized components are expensive to continually develop and improve. If these systems work successfully, NASA will be looking for other commercial technologies to use for space exploration.”
Instead of building increasingly large and complex exploratory missions, these low-cost accelerated missions could open the door for creativity, clever problem solving, and inspired missions with simple goals. Mission planners expect the next decade could see amazing developments as NASA continues to fund missions using this innovative concept.
“Simplicity was not a necessary aspect of this mission, but is clearly a driver for successful missions,” said Butler Hine, LADEE project manager at Ames. “The important thing is to maximize the success per dollar.”
NASA's Science Mission Directorate in Washington funds the LADEE mission. In addition to designing the spacecraft, Ames manages the overall mission, operates the spacecraft, and hosts the project scientist. Goddard manages the science instruments and technology demonstration payload, the science operations center and provides overall mission support. Wallops is responsible for launch vehicle integration, launch services and operations. NASA's Marshall Space Flight Center in Huntsville, Ala., manages LADEE within the Lunar Quest Program Office.
Saturday, September 7, 2013
Friday, September 6, 2013
Wednesday, September 4, 2013
Tuesday, September 3, 2013
Monday, September 2, 2013
Sunday, September 1, 2013
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