โพสต์เมื่อ 18 ธ.ค. 2557 | 00:13 น.
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NASA's Mars Curiosity rover has measured a tenfold spike in methane, an organic chemical, in the atmosphere around it and detected other organic molecules in a rock-powder sample collected by the robotic laboratory’s drill. Researchers used Curiosity’s onboard Sample Analysis at Mars (SAM) laboratory a dozen times in a 20-month period to sniff methane in the atmosphere. During two of those months, in late 2013 and early 2014, four measurements averaged seven parts per billion. Before and after that, readings averaged only one-tenth that level. Curiosity also detected different Martian organic chemicals in powder drilled from a rock dubbed Cumberland, the first definitive detection of organics in surface materials of Mars. These Martian organics could either have formed on Mars or been delivered to Mars by meteorites. Organic molecules, which contain carbon and usually hydrogen, are chemical building blocks of life, although they can exist without the presence of life. Curiosity's findings from analyzing samples of atmosphere and rock powder do not reveal whether Mars has ever harbored living microbes, but the findings do shed light on a chemically active modern Mars and on favorable conditions for life on ancient Mars. Pictured here is the drilling into Curiosity's rock target, "Cumberland," during the 279th Martian day, or sol, of the rover's work on Mars (May 19, 2013). Image Credit: NASA/JPL-Caltech/MSSS; -
Astronaut Terry Virts shared this image from the vantage point of the International Space Station on Sunday, Dec. 14. He tweeted that it shows "#sunset over the Gulf of Mexico and American gulf coast." Astronauts have used hand-held cameras to photograph the Earth for more than 40 years. Beginning with the Mercury missions in the early 1960s, astronauts have taken more than 700,000 photographs of the Earth. Today, the International Space Station continues the NASA tradition of Earth observation from human-tended spacecraft. Image credit: NASA #iss @iss; -
Opportunity Pausing at a Bright Outcrop on Endeavour Rim, Sol 3854 NASA's Mars Exploration Rover Opportunity is continuing its traverse southward on the western rim of Endeavour Crater during the fall of 2014, stopping to investigate targets of scientific interest along way. This view is from Opportunity's front hazard avoidance camera on Nov. 26, 2014, during the 3,854th Martian day, or sol, of the rover's work on Mars. This camera is mounted low on the rover and has a wide-angle lens. The scene includes Opportunity's robotic arm, called the "instrument deployment device," at upper left. Portions of the pale bedrock exposed on the ground in front of the rover are within the arm's reach. Researchers used instruments on the arm to examine a target called "Calera" on this patch of bedrock. The wheel tracks in the scene are from the drive -- in reverse -- to this location, a drive of 32.5 feet (9.9 meters) on Sol 3846 (Nov. 18, 2014). Image Credit: NASA/JPL-Caltech; -
A series of elliptical loops seemed to droop down out of an active region on the Sun that was rotating into view (Dec. 7-9, 2014). The loops are actually particles spiraling along magnetic field lines when viewed in a wavelength of extreme ultraviolet light. Above this group other loops above another active region are tighter and less elongated, but always changing as well. The video covers two days of activity. Video credit: NASA/SDO; -
Although solid-looking in many images, Saturn's rings are actually translucent. In this picture, we can glimpse the shadow of the rings on the planet through (and below) the A and C rings themselves, towards the lower right hand corner. For centuries people have studied Saturn's rings, but questions about the structure and composition of the rings lingered. It was only in 1857 when the physicist James Clerk Maxwell demonstrated that the rings must be composed of many small particles and not solid rings around the planet, and not until the 1970s that spectroscopic evidence definitively showed that the rings are composed mostly of water ice. This view looks toward the sunlit side of the rings from about 17 degrees above the ringplane. The image was taken with the Cassini spacecraft wide-angle camera on Aug. 12, 2014 in near-infrared light centered at 752 nanometers. The view was obtained at a distance of approximately 1.4 million miles (2.3 million kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 24 degrees. Image scale is 85 miles (136 kilometers) per pixel. Image Credit: NASA/JPL-Caltech/Space Science Institute;
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LOOK UP TONIGHT! The 2014 Geminid meteor shower is forecast to be a lively meteor shower with great views in the skies over Earth, and tonight is the anticipated peak. Best viewing will be in dark sky locations, away from city lights. Cloudy? We're hosting an overnight web chat from 11 p.m. to 3 a.m. EST and will broadcast the shower live on Ustream. Details: http://go.nasa.gov/1yUCCWP #geminids #meteor #meteorshower #skywatch #science #nasa #space; -
View of All That Glitters: This striking Hubble Space Telescope image shows a glittering bauble named Messier 92. Located in the northern constellation of Hercules, this globular cluster — a ball of stars that orbits a galactic core like a satellite — was first discovered by astronomer Johann Elert Bode in 1777. Messier 92 is one of the brightest globular clusters in the Milky Way, and is visible to the naked eye under good observing conditions. It is very tightly packed with stars, containing some 330,000 stars in total. As is characteristic of globular clusters, the predominant elements within Messier 92 are hydrogen and helium, with only traces of others. Credit: ESA/Hubble & NASA Acknowledgement: Gilles Chapdelaine #nasa #esa #hst #hubble #astronomy #astrophysics #space #science #galaxy #milkyway; -
Super Guppy Spends a Restful Night in the NASA Langley Hangar: A representative test article of a futuristic hybrid wing body aircraft will be unloaded from our Super Guppy aircraft on Friday, Dec. 12, at Langley Research Center in Hampton, Virginia.. The large test article, representing the uniquely shaped fuselage cross-section, is made out of a low-weight, damage-tolerant, stitched composite structural concept called Pultruded Rod Stitched Efficient Unitized Structure, or PRSEUS. Langley's Combined Loads Test System will subject the revolutionary carbon-fiber architecture test article to conditions that simulate loads typically encountered in flight. Our Super Guppy aircraft, designed to transport extremely large cargo, rests after making the special delivery to the Langley. The aircraft measures more than 48 feet to the top of its tail and has a wingspan of more than 156 feet with a 25-foot diameter cargo bay - the aircraft features a hinged nose that opens 110 degrees. Image Credit: NASA #nasaaero #aeronautics #nasa #langley #superguppy #aircraft; -
Galactic Get-Together Has Impressive Light Display: At this time of year, there are lots of gatherings often decorated with festive lights. When galaxies get together, there is the chance of a spectacular light show as is the case with NGC 2207 and IC 2163. Located about 130 million light years from Earth, in the constellation of Canis Major, this pair of spiral galaxies has been caught in a grazing encounter. Chandra image of "ultraluminous X-ray sources" (ULXs) found using data from NASA's Chandra X-ray Observatory. Image Credit: X-ray: NASA/CXC/SAO/S.Mineo et al, Optical: NASA/STScI, Infr #nasa #space #galaxy #astronomy #science; -
Throwback Thursday: Astronaut Eugene A. Cernan, Apollo 17 commander, salutes the deployed U.S. flag on the lunar surface during extravehicular activity of NASA's final lunar landing mission in the Apollo series. Apollo 17 landed on the moon on this day (December 11) in 1972. The lunar module is at the left background and the lunar roving vehicle, also in background, is partially obscured. The photo was made by Astronaut Harrison H. Schmitt, lunar module pilot. Photo Credit: NASA #TBT #NASA #MoonWalking #ThrowbackThursday;
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Colorful and Plankton-full Patagonian Waters: Late spring and summer weather brings blooms of color to the Atlantic Ocean off of South America, at least from a satellite view. The Patagonian Shelf Break is a biologically rich patch of ocean where airborne dust from the land, iron-rich currents from the south, and upwelling currents from the depths provide a bounty of nutrients for the grass of the sea—phytoplankton. In turn, those floating sunlight harvesters become food for some of the richest fisheries in the world. Image Credit: Norman Kuring, NASA’s Ocean Color Group, using VIIRS data from the Suomi National Polar-orbiting Partnership #earth #earthrightnow #nasa #atlanticocean #patagonian #science; -
Venus from Space Station: Astronaut Terry Virts aboard the International Space Station snapped this image and wrote, "Venus sits on the background of the Earth's atmosphere." Virts worked on medical science Wednesday morning and later set up commercial research gear for an experiment to be delivered on the next SpaceX mission, which is scheduled to launch Dec. 16. Meanwhile, station Commander Barry Wilmore and Italian astronaut Samantha Cristoforetti continued this week's maintenance work on a U.S. spacesuit. Image Credit: NASA #nasa #iss #spacestation #space #isscrew #astronauts #venus #earth #exp42; -
View from Above: From the International Space Station, Expedition 42 Commander Barry Wilmore took this photograph of the Great Lakes and central U.S. on Dec. 7, 2014, and posted it to social media. This week on the station, the Expedition 42 crew has been busy with medical science and spacesuit work while preparing for the arrival of SpaceX's Dragon commercial cargo craft, scheduled to launch on Dec. 16 on a two day trip to the station before it is captured by the Canadarm2 and berthed to the Harmony node. Image Credit: NASA/Barry Wilmore #nasa #iss #space #spacestation #exp42 #earth #greatlakes #isscargo #spacex; -
RoboSimian and Surrogate are robots that were designed and built at our Jet Propulsion Laboratory in Pasadena, California. Surrogate was designed more like a human -- with an upright spine, two arms and a head, standing about 4.5 feet (1.4 meters) tall and weighing about 200 pounds (90.7 kilograms). Its strength is in handling objects, and its flexible spine allows for extra manipulation capabilities. But the robot moves on tracks, which doesn't allow it to move over tall objects. A flight of stairs or a ladder would be problematic for Surrogate, for instance. RoboSimian is more ape-like, moving around on four limbs. It is better suited to travel over complicated terrain, including true climbing. In addition, Surrogate has only one set of "eyes" -- two cameras that allow for stereo vision -- mounted to its head. RoboSimian lacks a head but has up to seven sets of eyes, so it can see from its front, "stomach" and sides as well. Image Credit: JPL-Caltech #robots #nasa @NASAJPL; -
Orion at Port: The USS Anchorage, carrying the crew module, arrives in San Diego. The Orion spacecraft successfully completed the first flight last week, traveling to an altitude of 3600 miles and returning to Earth at 20,000 miles per hour. The Navy and NASA team on board the USS Anchorage recovered Orion in the Pacific Ocean after splashdown. Image Credit: US Navy. #orion #navy #nasa #space #testflight #orionlaunch #spacecraft #ussanchorage;
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