โพสต์เมื่อ 5 ก.ค. 2558 | 08:23 น.
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Happy 4th of July! We present some stellar fireworks! Stars are essentially giant fusion reactions occurring in the vacuum of space. Because stars have so much mass, they possess powerful gravitational force-but they don't collapse because of the outward force generated by nuclear fusion, continually converting hydrogen atoms to helium. Sometimes stars begin orbiting each other, forming a binary star system. Typically this involves a white dwarf star and a red giant. Orbiting the red giant like a moon, the dwarf star rips matter from its companion until it essentially gags on the excess, coughing hot gas and radiation into space. This dramatic phenomenon is relatively common, and the white dwarf is not destroyed in the resulting nova. Image Credit: NASA #nasa #space #astronomy #science #fourthofjuly #happyindependenceday #independenceday #4thofjuly #fireworks; -
This Hubble Space Telescope picture shows a galaxy named SBS 1415+437 (also called SDSS CGB 12067.1), located about 45 million light-years from Earth. SBS 1415+437 is a Wolf-Rayet galaxy, a type of star-bursting galaxy with an unusually high number of extremely hot and massive stars known as Wolf-Rayet stars. These stars can be around 20 times as massive as the sun, but seem to be on a mission to shed surplus mass as quickly as possible - they blast substantial winds of particles out into space, causing them to dwindle at a rapid rate. A typical star of this type can lose a mass equal to that of our sun in just 100,000 years! Image credit: ESA/Hubble & NASA #nasa hubble #hst #hubble25 #space #galaxy #astronomy #science; -
New Pluto images from our New Horizons spacecraft show two very different faces of the mysterious dwarf planet, one with a series of intriguing spots along the equator that are evenly spaced. Each of the spots is about 300 miles in diameter, with a surface area that's roughly the size of the state of Missouri. Scientists have yet to see anything quite like the dark spots; their presence has piqued the interest of the New Horizons science team, due to the remarkable consistency in their spacing and size. While the origin of the spots is a mystery for now, the answer may be revealed as the spacecraft continues its approach - July 14 is the flyby - to the mysterious dwarf planet. Image Credit: NASA #nasa #newhorizons #pluto #plutoflyby #science; -
NASA astronaut Scott Kelly (@StationCDRKelly) captured photographs and video of auroras from the International Space Station on June 22, 2015. Kelly wrote, "Yesterday's aurora was an impressive show from 250 miles up. Good morning from the International Space Station! #YearInSpace" Image Credit: NASA #iss #spacestation #space #nasa #aurora #earth; -
Come Fly with New Horizons on its Approach to Pluto: Images from New Horizons show the view from aboard the spacecraft closes in on the Pluto system for a July 14 flyby. This time-lapse approach movie was made from images from the Long Range Reconnaissance Imager (LORRI) camera aboard New Horizons spacecraft taken between May 28 and June 25, 2015. During that time the spacecraft distance to Pluto decreased almost threefold, from about 35 million miles to 14 million miles (56 million kilometers to 22 million kilometers). The images show Pluto and its largest moon, Charon, growing in apparent size as New Horizons closes in. As it rotates, Pluto displays a strongly contrasting surface dominated by a bright northern hemisphere, with a discontinuous band of darker material running along the equator. Charon has a dark polar region, and there are indications of brightness variations at lower latitudes. Credit: NASA/Johns Hopkins Applied Physics Laboratory/Southwest Research Institute #nasa #apl #space #newhorizons #pluto #plutoflyby #science;
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Eruption of Wolf Volcano: In late May 2015, the highest volcano in the Galapagos Islands erupted for the first time in 33 years. The explosive eruption at Wolf volcano on Isabela Island sent volcanic gases and ash roughly 15 kilometers (50,000 feet) into the sky, while lava flowed through a fissure, down eastern and southeastern slopes, and eventually reached the sea. In early June, the sulfur-rich lava flows on the slopes appeared to subside. This image of Wolf was acquired on June 11, 2015, by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on the Terra satellite. The false-color image combines near-infrared, red, and green light (ASTER bands 3-2-1), with vegetated areas appearing in red and lava generally appearing charcoal or black. Image Credit: NASA Earth Observatory image by Jesse Allen, using data from NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team #earth #nasa #earthrightnow #volcano #galapagos #lava #science; -
Countdown is progressing smoothly for today's scheduled launch of the seventh SpaceX commercial resupply services mission to the International Space Station. The rocket is scheduled to lift off from Space Launch Complex 40 at Cape Canaveral Air Force Station in Florida, carrying about two tons of supplies and science investigations in the cargo Dragon spacecraft. The chance for favorable weather at the 10:21 a.m. EDT liftoff remains at 90% percent. The two tons of cargo includes critical materials to support more than 35 of about 250 science and research investigations that will occur during the station's Expeditions 44 and 45 as well as the first of two International Docking Adapters that will enable U.S. commercial crew spacecraft to dock at the orbiting laboratory. Image Credit: NASA #spacex #nasa #space #isscargo #astronauts #iss #spacestation #science; -
This artist's concept shows a hypothetical "rejuvenated" planet -- a gas giant that has reclaimed its youthful infrared glow. Our Spitzer Space Telescope found tentative evidence for one such planet around a dead star, or white dwarf, called PG 0010+280 (depicted as white dot in illustration). Years ago, astronomers predicted that some massive, Jupiter-like planets might accumulate mass from their dying stars. As stars like our sun age, they puff up into red giants and then gradually lose about half or more of their mass, shrinking into skeletons of stars, called white dwarfs. The dying stars blow winds of material outward that could fall onto giant planets that might be orbiting in the outer reaches of the star system. Credits: NASA/JPL-Caltech #nasa #space #spitzer #exoplanet #science; -
The sun unleashed no less than five solar flares in five days this week all from the same dynamic active region (June 21-25, 2015). Many of these were associated with coronal mass ejections, most of which impacted Earth and generated beautiful auroral displays. The images were taken in a wavelength of extreme ultraviolet light. Flares are the bright flashes you see, followed by spirals of magnetic field lines as the active region reorganizes itself. Credit: Solar Dynamics Observatory, NASA #nasa #aurora #sun #solarflare #space #earth #science; -
This Hubble Space Telescope image shows a planetary nebula named NGC 6153, located about 4,000 light-years away in the southern constellation of Scorpius (The Scorpion). The faint blue haze across the frame shows what remains of a star like the sun after it has depleted most of its fuel. When this happens, the outer layers of the star are ejected, and get excited and ionized by the energetic ultraviolet light emitted by the bright hot core of the star, forming the nebula. NGC 6153 is a planetary nebula that is elliptical in shape, with an extremely rich network of loops and filaments, shown clearly in this Hubble image. Measurements show that NGC 6153 contains large amounts of neon, argon, oxygen, carbon and chlorine - up to three times more than can be found in the solar system. Image credit: ESA/Hubble & NASA, Acknowledgement: Matej Novak #nasa #space #hubble #hubble25 #hst #astronomy #nebula #science;
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The sun emitted a mid-level solar flare, peaking at 4:16 a.m. EDT on June 25. Our 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 in the layer where GPS and communications signals travel. This flare is classified as a M7.9 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. Credits: NASA/SDO #nasa #sun #sdo #solarflare #spaceweather #science #nasabeyond; -
A light echo in X-rays detected by our Chandra X-ray Observatory has provided a rare opportunity to precisely measure the distance to an object on the other side of the Milky Way galaxy. The rings exceed the field-of-view of Chandra's detectors, resulting in a partial image of X-ray data. Credits: NASA/CXC/U. Wisconsin/S. Heinz #nasa #space #astronomy #xray #milkyway #galaxy #chandra #science; -
NASA astronaut Scott Kelly (@StationCDRKelly) captured photographs and video of auroras from the International Space Station on June 22, 2015. Kelly wrote, " I've never seen this before- red #aurora. Spectacular! #YearInSpace." Kelly is on a one-year mission in space, testing the limits of human research, space exploration and the human spirit. Most expeditions to the space station last four to six months. By doubling the length of this mission, researchers hope to better understand how the human body reacts and adapts to long-duration spaceflight. This knowledge is critical as we look toward human journeys deeper into the solar system, including to and from Mars, which could last 500 days or longer. Image Credit: NASA #nasa #iss #space #isscrew #spacestation #science #journeytomars; -
A single crescent moon is a familiar sight in Earth's sky, but with Saturn's many moons, you can see three or even more. The three moons shown here -- Titan (3,200 miles or 5,150 kilometers across), Mimas (246 miles or 396 kilometers across), and Rhea (949 miles or 1,527 kilometers across) -- show marked contrasts. Titan, the largest moon in this image, appears fuzzy because we only see its cloud layers. And because Titan's atmosphere refracts light around the moon, its crescent "wraps" just a little further around the moon than it would on an airless body. Rhea (upper left) appears rough because its icy surface is heavily cratered. And a close inspection of Mimas (center bottom), though difficult to see at this scale, shows surface irregularities due to its own violent history. This view looks toward the anti-Saturn hemisphere of Titan. North on Titan is up. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 25, 2015. Credit: NASA/JPL-Caltech/Space Science Institute #nasa #cassini #saturn #space #moon #mimas #titan #rhea #science; -
In the Company of Dione NASA's Cassini imaging scientists processed this view of Saturn's moon Dione, taken during a close flyby on June 16, 2015. This was Cassini's fourth targeted flyby of Dione and the spacecraft had a close approach altitude of 321 miles (516 kilometers) from Dione's surface. Also making an appearance in this image is Saturn's geysering moon Enceladus, seen in the upper right, just above the bright line of Saturn's rings. North on Dione is up and rotated 44 degrees to the left. The image was taken in visible light with the Cassini spacecraft's wide-angle camera on June 16, 2015. The view was acquired at a distance of approximately 48,000 miles (77,000 kilometers) from Dione and at a sun-Dione-spacecraft, or phase, angle of 128 degrees. Image scale is 3 miles (5 kilometers) per pixel. Credit: NASA/JPL-Caltech/Space Science Institute #nasa #space #saturn #solarsystem #dione #moon #planet #planets;
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