โพสต์เมื่อ 12 พ.ย. 2557 | 12:02 น.
นาซา
Explore the universe and discover our home planet with the official NASA Instagram account
ของ NASA
มี 13,812 คนชอบรูปนี้
-
The ruddy color of Jupiter's Great Red Spot is likely a product of simple chemicals being broken apart by sunlight in the planet's upper atmosphere, according to a new analysis of data from NASA's Cassini mission. The results contradict the other leading theory for the origin of the spot's striking color -- that the reddish chemicals come from beneath Jupiter's clouds. Researchers arrived at their conclusions using a combination of data from Cassini's December 2000 Jupiter flyby and laboratory experiments. In the lab, the researchers blasted ammonia and acetylene gases -- chemicals known to exist on Jupiter -- with ultraviolet light, to simulate the sun's effects on these materials at the extreme heights of clouds in the Great Red Spot. This produced a reddish material, which the team compared to the Great Red Spot as observed by Cassini's Visible and Infrared Mapping Spectrometer (VIMS). They found that the light-scattering properties of their red concoction nicely matched a model of the Great Red Spot in which the red-colored material is confined to the uppermost reaches of the giant cyclone-like feature. A coloring agent confined to the top of the clouds would be inconsistent with the competing theory, which posits that the spot's red color is due to upwelling chemicals formed deep beneath the visible cloud layers, he said. If red material were being transported from below, it should be present at other altitudes as well, which would make the red spot redder still. The Great Red Spot is a long-lived feature in Jupiter's atmosphere that is as wide as two earths. Jupiter possesses three main cloud layers, which occupy specific altitudes in its skies; from highest to lowest they are: ammonia, ammonium hydrosulfide and water clouds. Image credit: NASA/JPL-Caltech/ Space Science Institute; -
Hubble Catches Jets, Bubbles, Bursts of Light in Taurus The NASA/ESA Hubble Space Telescope has snapped a striking view of a multiple star system called XZ Tauri, its neighbor HL Tauri, and several nearby young stellar objects. XZ Tauri is blowing a hot bubble of gas into the surrounding space, which is filled with bright and beautiful clumps that are emitting strong winds and jets. These objects illuminate the region, creating a truly dramatic scene. This dark and ominous landscape is located some 450 light-years away in the constellation of Taurus (The Bull). It lies in the northeastern part of a large, dark cloud known as LDN 1551. Just to the left of center in this image, embedded within a rust-colored cloud, lies XZ Tauri. While it appears to be a single star, this bright spot actually consists of several stars. It has long been known to be a binary, but one of these two stars is thought also to be a binary, making a total of three stars within a single system. Above and to the right of XZ Tauri, an equally epic scene is unfolding. Wisps of deep red seem to be streaking away from the blue-tinged clumps on the right. This bright blue patch contains a star known as HL Tauri, which is associated with Herbig-Haro object HH 150. Herbig-Haro objects are streaks of hot gas blasted into space by newborn and newly forming stars and LDN 1551 is particularly rich in these dramatic objects. In the bottom right of this Hubble image is another Herbig-Haro object known as HH 30 (opo9905), associated with the variable star V1213 Tauri. The star itself is hidden within a flat, bright disk of dust that is split in half by a dark lane. This dust blocks direct light from V1213 Tauri, but the star is visible via its reflected light and the prominent, knotty jets it is blasting out into space. Image credit: ESA/Hubble and NASA; acknowledgement: Judy Schmidt; -
Welcome home! Expedition 41 Flight Engineer Alexander Gerst of the European Space Agency (ESA), left, Commander Max Suraev of the Russian Federal Space Agency (Roscosmos), center, and NASA Flight Engineer Reid Wiseman, sit in chairs outside the Soyuz TMA-13M capsule just minutes after they landed in a remote area near the town of Arkalyk, Kazakhstan on Monday, Nov. 10, 2014. Suraev, Wiseman and Gerst returned to Earth after more than five months onboard the International Space Station where they served as members of the Expedition 40 and 41 crews. Image Credit: NASA/Bill Ingalls; -
Three of the crew members aboard the International Space Station are scheduled to depart the orbiting laboratory today, Sunday, Nov. 9 after almost six months aboard. NASA Television will provide complete coverage at www.nasa.gov/nasatv Expedition 41 Commander Max Suraev of the Russian Federal Space Agency (Roscosmos), NASA Flight Engineer Reid Wiseman and Flight Engineer Alexander Gerst of the European Space Agency (ESA) will undock their Soyuz spacecraft from the station at 7:30 p.m. EST for a landing in Kazakhstan at 10:58 p.m. (9:58 a.m. Nov. 10 Kazakh time). Their return will wrap up 165 days in space since launching from Kazakhstan on May 29 and a mission that covered almost 70 million miles in orbit. With their landing, Suraev will have spent 334 days in space on two flights, and Wiseman and Gerst will have logged 165 days in space on their first flights. At the time of undocking, Expedition 42 will formally begin aboard the station under the command of NASA astronaut Barry Wilmore. Along with his crewmates Alexander Samokutyaev and Elena Serova of Roscosmos, Wilmore will operate the station as a three-person crew for two weeks until the arrival of three new crew members. NASA astronaut Terry Virts, Russian cosmonaut Anton Shkaplerov and ESA astronaut Samantha Cristoforetti are scheduled to launch from Baikonur, Kazakhstan, Nov. 23, (U.S. time). Image credit: NASA; -
Hubble View of Bubbly Nebula This image from Hubble’s Wide Field Planetary Camera 2 showcases NGC 1501, a complex planetary nebula located in the large but faint constellation of Camelopardalis (The Giraffe). Discovered by William Herschel in 1787, NGC 1501 is a planetary nebula that is just under 5,000 light-years away from us. Astronomers have modeled the three-dimensional structure of the nebula, finding it to be a cloud shaped as an irregular ellipsoid filled with bumpy and bubbly regions. It has a bright central star that can be seen easily in this image, shining brightly from within the nebula’s cloud. This bright pearl embedded within its glowing shell inspired the nebula’s popular nickname: the Oyster Nebula. While NGC 1501's central star blasted off its outer shell long ago, it still remains very hot and luminous, although it is quite tricky for observers to spot through modest telescopes. This star has actually been the subject of many studies by astronomers due to one very unusual feature: it seems to be pulsating, varying quite significantly in brightness over a typical timescale of just half an hour. While variable stars are not unusual, it is uncommon to find one at the heart of a planetary nebula. It is important to note that the colors in this image are arbitrary. Image credit: ESA/Hubble & NASA; acknowledgement: Marc Canale;
-
Mimicking the Moon When Galileo first observed Venus displaying a crescent phase, he excitedly wrote to Kepler (in anagram) of Venus mimicking the moon-goddess. He would have been delirious with joy to see Saturn and Titan, seen in this image, doing the same thing. More than just pretty pictures, high-phase observations - taken looking generally toward the Sun, as in this image - are very powerful scientifically since the way atmospheres and rings transmit sunlight is often diagnostic of compositions and physical states. In this example, Titan's crescent nearly encircles its disk due to the small haze particles high in its atmosphere scattering the incoming light of the distant Sun. This view looks toward the sunlit side of the rings from about 3 degrees above the ringplane. The image was taken in violet light with the Cassini spacecraft wide-angle camera on Aug. 11, 2013. The view was obtained at a distance of approximately 1.1 million miles (1.7 million kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 154 degrees. Image scale is 64 miles (103 kilometers) per pixel. Credit: NASA/JPL-Caltech/Space Science Institute; -
Astronomers using NASA’s Hubble Space Telescope have completed the largest and most sensitive visible-light imaging survey of dusty debris disks around other stars. These dusty disks, likely created by collisions between leftover objects from planet formation, were imaged around stars as young as 10 million years old and as mature as more than 1 billion years old. Once thought to be simply pancake-like structures, the unexpected diversity and complexity and varying distribution of dust among these debris systems strongly suggest the disks are gravitationally-affected by unseen exoplanets orbiting the star. Alternatively, these effects could result from the stars passing through interstellar space. This is an image from the Hubble Space Telescope visible-light survey of the architecture of debris systems around young stars. Hubble's sharp view uncovers an unexpected diversity and complexity in the structures. Image Credit: NASA/ESA/G. Schneider/U. Arizona; -
NASA Astronaut Reid Wiseman shared this image of Yosemite via his twitter account this morning. Wiseman later tweeted: "We cranked up our #Soyuz this morning and test fired all the thrusters. Everything worked flawlessly - ready for a Sunday departure." The homebound Expedition 40/41 trio, consisting of Soyuz Commander Max Suraev and Flight Engineers Alexander Gerst and Wiseman, is counting down to its Nov. 9 departure inside the Soyuz TMA-13M spacecraft. They are packing gear to be returned home while they continue science and maintenance on the U.S. side of the International Space Station. Back on Earth, the new Expedition 42/43 crew is getting ready for its launch to the space station from the Baikonur Cosmodrome in Kazakhstan on Nov. 23. Soyuz Commander Anton Shkaplerov will be joined by NASA astronaut Terry Virts and European Space Agency astronaut Samantha Cristoforetti aboard a Soyuz TMA-15M spacecraft to begin a 5-1/2 month mission aboard the orbital laboratory. Image Credit: NASA/Reid Wiseman #iss #soyuz #yosemite #earth #space #nasa @iss; -
Throwback Thursday: Driving the Lunar Rover Astronaut Eugene A. Cernan, Apollo 17 mission commander, makes a short checkout of the Lunar Roving Vehicle during the early part of the first Apollo 17 extravehicular activity at the Taurus-Littrow landing site. This view of the "stripped down" Rover is prior to load up. This photograph was taken by Geologist-Astronaut Harrison H. Schmitt, Lunar Module pilot. The mountain in the right background is the East end of South Massif. Image credit: NASA #TBT #NASA #History #Apollo17 #Moon #1972 #space #Throwbackthursday; -
An active region on the sun emitted a mid-level solar flare, peaking at 4:47 a.m. EST on Nov. 5, 2014. This is the second mid-level flare from the same active region, labeled AR 12205, which rotated over the left limb of the sun on Nov. 3. The image was captured by NASA's Solar Dynamics Observatory (SDO) in extreme ultraviolet light that was colorized in red and gold. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel. This flare is classified as an M7.9-class flare. M-class flares are a tenth the size of the most intense flares, the X-class flares. The number provides more information about its strength. An M2 is twice as intense as an M1, an M3 is three times as intense, etc. Image Credit: NASA/SDO #SDO #SolarFlare #Sun #Solar #nasa #space;
-
Orion Prepares to Move to Launch Pad On Dec. 4, Orion is scheduled to launch atop a United Launch Alliance Delta IV Heavy rocket from Cape Canaveral Air Force Station’s Space Launch Complex 37 in Florida. During the test, Orion will travel 3,600 miles in altitude above Earth. 4 1/2 hours later, the spacecraft will reenter the atmosphere at 20,000 mph and splash down in the Pacific Ocean. Orion’s first flight will verify launch and high-speed reentry systems such as avionics, attitude control, parachutes and the heat shield. Four recently-installed protective panels make up Orion's Ogive. The Ogive reduces drag and acoustic load on the crew module, making it a smoother ride for the spacecraft. Pictured here, inside the Launch Abort System Facility at NASA’s Kennedy Space Center in Florida, a crane brings the fourth and final Ogive panel closer for installation on Orion's Launch Abort System. The Ogive installation was one of the last pieces of the puzzle for Orion prior to its move to the launch pad on Nov. 10. There, it will be lifted and attached to the rocket for its December launch. Image Credit: NASA #orion #nasaorion @exploreNASA #nasa #space; -
Reddish rock powder from the first hole drilled into a Martian mountain by NASA's Curiosity rover has yielded the mission's first confirmation of a mineral mapped from orbit. Curiosity collected the powder by drilling into a rock outcrop at the base of Mount Sharp in late September. The robotic arm delivered a pinch of the sample to the Chemistry and Mineralogy (CheMin) instrument inside the rover. This sample, from a target called "Confidence Hills" within the "Pahrump Hills" outcrop, contained much more hematite than any rock or soil sample previously analyzed by CheMin during the two-year-old mission. Hematite is an iron-oxide mineral that gives clues about ancient environmental conditions from when it formed. In observations reported in 2010, before selection of Curiosity's landing site, a mineral-mapping instrument on NASA's Mars Reconnaissance Orbiter provided evidence of hematite in the geological unit that includes the Pahrump Hills outcrop. The landing site is inside Gale Crater, an impact basin about 96 miles (154 kilometers) in diameter with the layered Mount Sharp rising about three miles (five kilometers) high in the center. This image shows the first holes drilled by NASA's Mars rover Curiosity at Mount Sharp. The loose material near the drill holes is drill tailings and an accumulation of dust that slid down the rock during drilling. Image Credit: NASA/JPL-Caltech/MSSS #mars #marscuriosity #redplanet #solarsystem #nasa #space #marsrover; -
The sun emitted a mid-level solar flare, peaking at 5:40 p.m. EST on Nov. 3, 2014. NASA’s Solar Dynamics Observatory, which watches the sun constantly, captured an image of the event. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however, when intense enough, they can disturb the atmosphere where GPS and communications signals travel. Image Credit: NASA/SDO #SDO #SolarFlare #Sun #Solar #nasa #space; -
Glaciers and mountains in the evening sun are seen on an Operation IceBridge research flight, returning from West Antarctica on Oct. 29, 2014. NASA is carrying out its sixth consecutive year of Operation IceBridge research flights over Antarctica to study changes in the continent’s ice sheet, glaciers and sea ice. This year’s airborne campaign revisits a section of the Antarctic ice sheet that recently was found to be in irreversible decline. IceBridge uses a suite of instruments that includes a laser altimeter, radar instruments, cameras, and a gravimeter, which is an instrument that detects small changes in gravity. These small changes reveal how much mass these glaciers have lost. Researchers plan to measure previously unsurveyed regions of Antarctica, such as the upper portions of Smith Glacier in West Antarctica, which is thinning faster than any other glaciers in the region. The mission also plans to collect data in portions of the Antarctic Peninsula, such as the Larsen C, George VI and Wilkins ice shelves and the glaciers that drain into them. The Antarctic Peninsula has been warming faster than the rest of the continent. In addition to extending the data record of NASA’s Ice, Cloud and Land Elevation Satellite (ICESat), which stopped collecting data in 2009, IceBridge will also help set the stage for ICESat-2 by measuring ice the satellite will fly over. Image Credit: NASA/Michael Studinger #IceBridge #EarthRightNow #EarthScience #Ice #IceSat #NASA #Space #AirborneScience; -
Operation IceBridge: The only way to know how thing are changing is to monitor them at regular intervals. When it comes to climate change, regular measurements are essential. As the Earth’s polar caps respond to changing global climate conditions, experts rely on satellite measurements to make accurate, regular measurements. But satellites don’t last forever, and while the world waits for a new vehicle to get into space, NASA has a team in the field to gather vital data and fill in the gaps. It’s called Operation IceBridge, and it’s going on right now in the low altitude skies over Antarctica. Credit: NASA/Goddard/IceBridge #IceBridge #EarthRightNow #EarthScience #Ice #IceSat #NASA #Space #AirborneScience;
Instagram is a registered trademark of Instagram, inc.
