May 31 2012
From The Space Library
RELEASE: 12-159 NASA'S HUBBLE SHOWS MILKY WAY IS DESTINED FOR HEAD-ON COLLISION
WASHINGTON -- NASA astronomers announced Thursday they can now predict with certainty the next major cosmic event to affect our galaxy, sun, and solar system: the titanic collision of our Milky Way galaxy with the neighboring Andromeda galaxy. The Milky Way is destined to get a major makeover during the encounter, which is predicted to happen four billion years from now. It is likely the sun will be flung into a new region of our galaxy, but our Earth and solar system are in no danger of being destroyed. "Our findings are statistically consistent with a head-on collision between the Andromeda galaxy and our Milky Way galaxy," said Roeland van der Marel of the Space Telescope Science Institute (STScI) in Baltimore. The solution came through painstaking NASA Hubble Space Telescope measurements of the motion of Andromeda, which also is known as M31. The galaxy is now 2.5 million light-years away, but it is inexorably falling toward the Milky Way under the mutual pull of gravity between the two galaxies and the invisible dark matter that surrounds them both. "After nearly a century of speculation about the future destiny of Andromeda and our Milky Way, we at last have a clear picture of how events will unfold over the coming billions of years," said Sangmo Tony Sohn of STScI. The scenario is like a baseball batter watching an oncoming fastball. Although Andromeda is approaching us more than two thousand times faster, it will take 4 billion years before the strike. Computer simulations derived from Hubble's data show that it will take an additional two billion years after the encounter for the interacting galaxies to completely merge under the tug of gravity and reshape into a single elliptical galaxy similar to the kind commonly seen in the local universe. Although the galaxies will plow into each other, stars inside each galaxy are so far apart that they will not collide with other stars during the encounter. However, the stars will be thrown into different orbits around the new galactic center. Simulations show that our solar system will probably be tossed much farther from the galactic core than it is today. To make matters more complicated, M31's small companion, the Triangulum galaxy, M33, will join in the collision and perhaps later merge with the M31/Milky Way pair. There is a small chance that M33 will hit the Milky Way first. The universe is expanding and accelerating, and collisions between galaxies in close proximity to each other still happen because they are bound by the gravity of the dark matter surrounding them. The Hubble Space Telescope's deep views of the universe show such encounters between galaxies were more common in the past when the universe was smaller. A century ago astronomers did not realize that M31 was a separate galaxy far beyond the stars of the Milky Way. Edwin Hubble measured its vast distance by uncovering a variable star that served as a "milepost marker." Hubble went on to discover the expanding universe where galaxies are rushing away from us, but it has long been known that M31 is moving toward the Milky Way at about 250,000 miles per hour. That is fast enough to travel from here to the moon in one hour. The measurement was made using the Doppler effect, which is a change in frequency and wavelength of waves produced by a moving source relative to an observer, to measure how starlight in the galaxy has been compressed by Andromeda's motion toward us. Previously, it was unknown whether the far-future encounter will be a miss, glancing blow, or head-on smashup. This depends on M31's tangential motion. Until now, astronomers had not been able to measure M31's sideways motion in the sky, despite attempts dating back more than a century. The Hubble Space Telescope team, led by van der Marel, conducted extraordinarily precise observations of the sideways motion of M31 that remove any doubt that it is destined to collide and merge with the Milky Way. "This was accomplished by repeatedly observing select regions of the galaxy over a five- to seven-year period," said Jay Anderson of STScI. "In the worst-case-scenario simulation, M31 slams into the Milky Way head-on and the stars are all scattered into different orbits," said Gurtina Besla of Columbia University in New York. "The stellar populations of both galaxies are jostled, and the Milky Way loses its flattened pancake shape with most of the stars on nearly circular orbits. The galaxies' cores merge, and the stars settle into randomized orbits to create an elliptical-shaped galaxy." The space shuttle servicing missions to Hubble upgraded it with ever more-powerful cameras, which have given astronomers a long-enough time baseline to make the critical measurements needed to nail down M31's motion. The Hubble observations and the consequences of the merger are reported in three papers that will appear in an upcoming issue of the Astrophysical Journal.
RELEASE: 12-178 NASA SEEKS EARLY STAGE INNOVATIONS FOR SPACE TECHNOLOGIES FROM U.S. UNIVERSITIES
WASHINGTON -- NASA is seeking proposals from accredited U.S. universities focused on innovative, early-stage space technologies that will improve shielding from space radiation, spacecraft thermal management and optical systems. Each of these technology areas requires dramatic improvements over existing capabilities for future science and human exploration missions. Early stage, or low technology readiness level (TRL) concepts, could mature into tools that solve the hard challenges facing future NASA missions. Researchers should propose unique, disruptive or transformational space technologies that address the specific topics described in this new solicitation. "Both science and human deep space missions pose serious challenges that require new, innovative technological solutions," said Space Technology Program Director Michael Gazarik at NASA Headquarters in Washington. "Radiation, thermal management and optical systems were all identified in the National Research Council's report on NASA Space Technology Roadmaps as priority research areas. This call seeks new ideas in these areas." Space radiation poses a known danger to the health of astronauts. NASA is seeking proposals in the area of active radiation shielding (such as "shields" of electromagnetic force fields surrounding a spacecraft to block incoming radiation) or new, multifunction materials that are superior to those that exist today are sought. NASA also is interested in new technologies for active monitoring and read-out of radiation levels astronauts receive during long space trips. Current space technology for thermal management of fuels in space is limited. NASA is seeking early-stage technologies to improve ways spacecraft fuel tanks and in-space filling stations store cryogenic (very low temperature) propellants, such as hydrogen, over long periods of time and distances. NASA also is seeking novel, low-TRL heat rejection technologies which operate reliably and efficiently over a wide range of thermal conditions. The next generation of lightweight mirrors and telescopes requires advanced optical systems. NASA is seeking advancement of early-stage active wavefront sensing and control system technologies that enable deployable, large aperture space-based observatories; technologies which enable cost-effective development of grazing-incidence optical systems; and novel techniques to focus and detect X-ray photons and other high-energy particles. NASA expects to make approximately 10 awards this fall, based on the merit of proposals received. The awards will be made for one year, with an additional year of research possible. The typical annual award value is expected to be approximately $250,000. Second year funding will be contingent on the availability of appropriated funds and technical progress. Only accredited U.S. universities may submit proposals to this solicitation. Notices of intent are due by June 21, 2012, with proposals due July 12.
RELEASE: 12-179 SPACEX DRAGON CAPSULE RETURNS TO EARTH AFTER FIRST COMMERCIAL FLIGHT TO SPACE STATION
HOUSTON -- SpaceX's Dragon capsule splashed down in the Pacific Ocean at 11:42 a.m. EDT a few hundred miles west of Baja California, Mexico, marking a successful end to the first mission by a commercial company to resupply the International Space Station. "Congratulations to the teams at SpaceX and NASA who worked hard to make this first commercial mission to the International Space Station an overwhelming success," NASA Administrator Charles Bolden said. "This successful splashdown and the many other achievements of this mission herald a new era in U.S. commercial spaceflight. American innovation and inspiration have once again shown their great strength in the design and operation of a new generation of vehicles to carry cargo to our laboratory in space. Now more than ever we're counting on the inventiveness of American companies and American workers to make the International Space Station and other low Earth orbit destinations accessible to any and all who have dreams of space travel." The Dragon capsule will be taken by boat to a port near Los Angeles, where it will be prepared for a return journey to SpaceX's test facility in McGregor, Texas, for processing. Some cargo will be removed at the port in California and returned to NASA within 48 hours. The remainder will be returned to Texas with the capsule. The capsule delivered to the station 1,014 pounds of supplies including experiments, food, clothing and technology. On its return trip to Earth, the capsule carried science experiments that will be returned to researchers hoping to gain new insights provided by the unique microgravity environment in the station's laboratories. In addition to the experiments, Dragon returned a total of 1,367 pounds of hardware and cargo no longer needed aboard the station. Dragon's journey to the space station was SpaceX's second demonstration mission under NASA's Commercial Orbital Transportation Services (COTS) Program, which provides investments to stimulate the commercial space industry in America. The mission began May 22 as the capsule launched from Cape Canaveral Air Force Station in Florida aboard a SpaceX Falcon 9 rocket. Following a series of tests of its maneuverability and abort systems, the capsule was grappled and berthed to the space station by the crew members of Expedition 31 aboard the orbiting complex. In the next several weeks, NASA will evaluate the Dragon capsule's mission performance to close out remaining COTS milestones. Once that work is completed NASA and SpaceX will set the target date for the company's first full cargo mission. In addition to fostering the development of new American cargo vehicles, NASA also is helping spur innovation and development of new spacecraft and launch vehicles from the commercial industry to develop safe, reliable and cost-effective capabilities to transport astronauts to low Earth orbit and the space station. NASA also is developing the Orion spacecraft and Space Launch System (SLS), a crew capsule and heavy-lift rocket that will provide an entirely new capability for human exploration beyond low Earth orbit. Designed to be flexible for launching spacecraft for crew and cargo missions, SLS and Orion will expand human presence beyond low Earth orbit and enable new missions of exploration across the solar system.
RELEASE: 12-180 NASA'S COMMERCIAL CREW PARTNER SIERRA NEVADA CORPORATION COMPLETES DREAM CHASER FLIGHT TEST MILESTONE
LOUISVILLE, Colo. -- Sierra Nevada Corporation (SNC) Space Systems successfully completed a "captive carry test" of its full-scale Dream Chaser orbital crew vehicle Tuesday, marking a new milestone in the company's effort to develop transportation for astronauts to low Earth orbit and the International Space Station. During the test, the Dream Chaser flight vehicle was carried under an Erickson Air-Crane helicopter to assess the vehicle's aerodynamic flight performance, which will allow additional flight tests in the future. The helicopter flew for approximately an hour near the Rocky Mountain Metropolitan Airport in Jefferson County, Colo. . SNC is one of several companies working to develop commercial crew transportation capabilities under the Commercial Crew Development Round 2 (CCDev2) agreement with NASA's Commercial Crew Program (CCP), which is helping spur innovation and development of new spacecraft and launch vehicles from the commercial industry. "This is a very positive success for the Dream Chaser team and their innovative approach," NASA CCP Program Manager Ed Mango said. "I applaud and encourage the designers and engineers to continue their efforts in meeting the objectives of the rest of their CCDev2 milestones." The Dream Chaser is designed to carry as many as seven astronauts to space. It is the only spacecraft under CCDev2 that is winged and designed to land on a conventional runway. Data from the test will provide SNC an early opportunity to evaluate and prove hardware, facilities and ground operations in preparation for approach and landing tests scheduled for later this year. "The successful captive carry flight test of the Dream Chaser full scale flight vehicle marks the beginning of SNC's flight test program, a program that could culminate in crewed missions to the International Space Station for NASA," said Steve Lindsey, former NASA astronaut and head of Dream Chaser's flight operations for SNC. Additional milestones leading up to the test included evaluating the performance of the main landing gear selected for use on the Dream Chaser flight vehicle, an interface test to demonstrate the release mechanism between the spacecraft prototype and the heavy-lift helicopter, and a thorough flight test readiness review with engineers, technical experts and representatives from SNC and NASA. Another milestone evaluated the separation system compatibility of Dream Chaser with its initial launch vehicle, the United Launch Alliance Atlas V rocket, which would be used to release the spacecraft from the rocket's second stage after it has placed the spacecraft into low Earth orbit. All of NASA's industry partners, including SNC, continue to meet their established milestones in developing commercial crew transportation capabilities.
RELEASE: 12-181 NASA BEGINS DEVELOPMENT OF SPACE LAUNCH SYSTEM FLIGHT SOFTWARE
HUNTSVILLE, Ala. -- NASA engineers working on the new Space Launch System (SLS) can now begin developing the advanced, heavy-lift launch vehicle's flight software using newly delivered software test bed computers from Boeing. The SLS will launch NASA's Orion spacecraft and provide an entirely new capability for human exploration beyond Earth's orbit. Designed to be flexible for crew or cargo missions, SLS and Orion will be safe, affordable, sustainable and continue America's journey of discovery from the unique vantage point of space. "We are moving out very quickly on SLS," said Todd May, Space Launch System Program manager at NASA's Marshall Space Flight Center in Huntsville, Ala. "SLS will be the most powerful launch vehicle ever built, and it requires the most capable flight software in the history of human spaceflight. Having this avionics hardware in place early will allow the NASA SLS team and Boeing to accelerate the flight software development." The Boeing test bed computers make it possible for NASA to begin fine-tuning the launch vehicle's software. The flight software then will be installed in the Software Integration Test Facility at Marshall and tested with other electrical hardware and software. In this facility, the SLS team can run a variety of simulations to evaluate how the vehicle will perform in space. The final SLS flight computer that will run the flight software will have the highest processing capability available in a flight avionics computer. It is being developed by upgrading existing systems used in Global Positioning System and communication satellites. The first test flight of the SLS is scheduled for 2017, for which the launch vehicle will be configured for a 70-metric ton lift capacity. An evolved, two-stage launch vehicle configuration will provide a lift capability of 130 metric tons to enable missions beyond Earth's orbit and support deep space exploration. The SLS software test bed computers were developed by The Boeing Company and delivered to Marshall ahead of schedule. Availability of this test bed platform early in the engineering development phase allows more time for NASA programmers to develop the most capable flight software in the history of spaceflight.
CONTRACT RELEASE: C12-023 NASA SELECTS OMNIBUS MULTIDISCIPLINE ENGINEERING SERVICES CONTRACT
WASHINGTON -- NASA has selected SGT Inc., of Greenbelt, Md., for the Omnibus Multidiscipline Engineering Services contract for the Applied Engineering and Technology Directorate at NASA's Goddard Space Flight Center in Greenbelt, Md. This is a cost-plus-fixed-fee, indefinite-delivery/indefinite-quantity contract with a maximum ordering value of $400 million. The effective ordering period is from June 1, 2012, through May 31, 2017. SGT will provide services for development and validation of new technologies for future space and science missions. This will include study, design, systems engineering, development, fabrication, integration, testing, verification and operations of space flight, airborne and ground system hardware and software. The Applied Engineering and Technology Directorate is responsible for providing multidiscipline engineering expertise for both in-house and out-of-house instrument and spacecraft programs, including the Joint Polar Satellite System and the Space Servicing Capabilities Project. Task orders issued will be performed at Goddard and the contractor's facility.
MEDIA ADVISORY: M12-099 STUDENTS NATIONWIDE TO EXHIBIT NASA SPACECRAFT LUNAR IMAGES
WASHINGTON -- Media representatives are invited to see middle-school students and their teachers demonstrate science lessons and highlight selected images provided by twin NASA spacecraft studying the moon from crust to core. The event will take place from 10 a.m. to noon, Friday, June 1, 2012, at the Ronald Reagan Building and International Trade Center located at 1300 Pennsylvania Ave. NW in Washington. The event showcases an education and public outreach project called MoonKAM (Moon Knowledge Acquired by Middle school students). MoonKAM provides students around the world an opportunity to identify and choose images of the moon's surface using small cameras aboard NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission. To date, thousands of images of lunar targets have been selected by fifth- to eighth-grade students. MoonKAM is operated by Sally Ride Science in collaboration with undergraduate students at the University of California in San Diego. Sally Ride, CEO of the science education company and America's first woman in space, will host the event and provide opening remarks. Participants include: -- Lori Garver, NASA deputy administrator, Washington -- Maria Zuber, GRAIL principal investigator, Massachusetts Institute of Technology, Cambridge, Mass.
