We detected what some might call the X-rays howls of zombie stars! Translation for astronomers: NuSTAR detected a surplus of high-energy X-ray emission in the center of our galaxy, which might be coming from a population of compact, dead stars.
Peering into the heart of the Milky Way galaxy, NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR) has spotted a mysterious glow of high-energy X-rays that, according to scientists, could be the “howls” of dead stars as they feed on stellar companions.
The complete story courtesy of NuSTAR Satellite and Caltech is here.
NASA’s MAVEN Mission to Mars Timeline Photo
NASA has beefed up a process of traffic monitoring, communication and maneuver planning to ensure that #Mars orbiters do not approach each other too closely.
Last year’s addition of two new spacecraft orbiting Mars brought the census of active Mars orbiters to five, the most ever. MAVEN and ISRO’s Mars Orbiter Mission joined the 2003 Mars Express from the ESA – European Space Agency and two from NASA: the 2001 Mars Odyssey and the 2006 Mars Reconnaissance Orbiter (MRO). The newly enhanced collision-avoidance process also tracks the approximate location of NASA’s Mars Global Surveyor, a 1997 orbiter that is no longer working.
It’s not just the total number that matters, but also the types of orbits missions use for achieving their science goals. #MAVEN, which reached Mars on Sept. 21, 2014, studies the upper atmosphere. It flies an elongated orbit, sometimes farther from Mars than NASA’s other orbiters and sometimes closer to Mars, so it crosses altitudes occupied by those orbiters. For safety, NASA also monitors positions of ESA’s and India’s orbiters, which both fly elongated orbits.
Article Courtesy of NASA’s MAVEN Mission to Mars
Read the full feature, here:
NASA Jet Propulsion Laboratory
NASA – National Aeronautics and Space Administration
Photo Credit NASA’s MAVEN Mission to Mars Timeline
MAVEN’s primary mission includes five 5-day “deep-dip” campaigns, in which the periapsis (lowest point in the orbit) is lowered from about 93 miles (150 km) to about 77 miles (125 km). The current campaign is scheduled to coincide with the periapsis of the spacecraft crossing Mars’ equator into the southern hemisphere for the first time.
At an altitude of 77 miles (125 km), Mars’ atmosphere is around 30 times more dense than it is at MAVEN’s nominal science mapping periapsis of 93 miles (150 km). To accommodate for the increase in atmospheric density, the spacecraft’s solar panels are bent at a 20° angle, which shifts the center of air pressure away from the center of gravity, providing self-stabilization.
The “deep dip” campaigns will provide data from the boundary where Mars’ upper and lower atmospheres meet—also referred to as the “homopause”—enabling the spacecraft to sample the entire upper atmosphere of Mars.
Credit Orbital ATK
The aircraft that air-launches the Pegasus rocket has been repainted with new livery to mark the recent corporate merge that formed Orbital ATK.
The L-1011 jet, named Stargazer, carries the light-class Pegasus launchers to an altitude of 39,000 feet and releases the booster to fire into space.
Pegasus has flown 42 times and the 32 using the XL version. The rocket weighs 51,000 pounds, stretches 55 feet long and is comprised of three solid-fueled stages for boosting small satellites into orbit. Launches have occurred from California, Virginia, Florida, the Canary Islands and the Kwajalein Atoll in the Marshall Islands.
Image Credit Orbita ATK
Stargazer was delivered to Air Canada in March 1974. It was purchased by Orbital ATK in 1992 and modified as the Pegasus launch platform.With the push of a button in the Stargazer’s cockpit by the co-pilot, the rocket is cast free to fall for five seconds, dropping 300 feet below the aircraft while traveling at Mach 0.82. During the plunge, the onboard flight computer will sense the rocket’s separation from the carrier jet and issues a command to release the safety inhibits in preparation for ignition.
The first stage solid-fueled motor of Pegasus is lit at T+plus 5 seconds to begin the powered journey to orbit. The rocket’s heritage includes deploying over 70 satellites since 1990 for NASA, commercial customers and the U.S. military.
Pegasus celebrated the 25th anniversary of its maiden launch on April 5.
Two more Pegasus flights are on the NASA manifest for 2016 and 2017. The first will launch eight Cyclone Global Navigation Satellite System, or CYGNSS, spacecraft into orbit from Florida and the second will carry the Ionospheric Connection Explorer, or ICON, to space from the Marshall Islands.
Join us for Cal Day, Saturday, April 18th, from 11am-5pm, the one day each year that UC Berkeley’s Space Sciences Lab opens its doors to the public. Shuttles will be transporting the public every 15 minutes from Hearst Mining Circle on campus to SSL. Activities include walking tours of UC Berkeley’s cutting-edge space science research lab, as well as talks on topics such as space weather, teens doing art-science mashups, a career panel on cool jobs in space science, and hands-on activities for all ages! Get your Science@Cal Passports here, with activities for children 5 and up.
For more information, go to the Events page on this website!
Visit Our Neighbor: Lawrence Hall of Science
See how the Hall is inspiring the next generation of scientists, engineers, and designers. Have your Science@Cal passport stamped as you explore the wonderful world of science. Join free Planetarium presentations, design your own nano creations, and explore real-time datasets on Science On a Sphere. For more information, visit the Hall’s Cal Day page [link to: http://www.lawrencehallofscience.org/visit/events/cal_day]
MAVEN completed 1,000 orbits around the Red Planet on April 6, 2015, four-and-a-half months into its one-year primary mission.
MAVEN is in its science-mapping orbit and has been taking data since the start of its primary mission on Nov. 16, 2014. The furthest point (apoapsis) in the spacecraft’s elliptical orbit has been 6,500 kilometers (4,039 miles) and the closest (periapsis) 130 kilometers (81 miles) above the #Martiansurface.
Shown here is an artist’s conception of MAVEN’s Imaging UltraViolet Spectrograph (IUVS) observing the “Christmas lights aurora” on Mars. MAVEN observations show that aurora on Mars is similar to Earth’s “Northern Lights” but has a different origin. (Courtesy CU/LASP)
The #MAVEN spacecraft has observed two unexpected phenomena in the #Martian atmosphere: an unexplained high-altitude dust cloud and aurora that reaches deep into the Martian atmosphere.
Shown here is a map of the MAVEN Imaging Ultraviolet Spectrograph’s auroral detections in December 2014 overlaid on Mars’ surface. The map shows that the aurora was widespread in the northern hemisphere, not tied to any geographic location. The aurora was detected in all observations during a 5-day period, though no data were taken in the southern hemisphere and some regions in the northern hemisphere were missed. (Courtesy CU/LASP)
Read the full story, here.
Courtesy of NASA’s MAVEN Mission to Mars