โพสต์เมื่อ 28 มี.ค. 2558 | 03:00 น.
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Clues that May Help Identify Dark Matter: Using observations from NASA’s Hubble Space Telescope and Chandra X-ray Observatory, astronomers have found that dark matter does not slow down when colliding with itself, meaning it interacts with itself less than previously thought. Researchers say this finding narrows down the options for what this mysterious substance might be. Dark matter is an invisible matter that makes up most of the mass of the universe. Because dark matter does not reflect, absorb or emit light, it can only be traced indirectly by, such as by measuring how it warps space through gravitational lensing, during which the light from a distant source is magnified and distorted by the gravity of dark matter. Here are images of four different galaxy clusters taken with Hubble (blue) and Chandra (pink) in a study of how dark matter in clusters of galaxies behaves when the clusters collide. A total of 72 large cluster collisions were studied. Image Credit: NASA and ESA #nasa #space #chandra #hubble #hst #hubble25 #astronomy #darkmatter #science; -
Ready to launch astronauts on a one-year mission, the Soyuz TMA-16M spacecraft is seen after having rolled out by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Wednesday, March 25, 2015. NASA astronaut Scott Kelly and Russian cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch to the International Space Station in the Soyuz at 3:42 p.m. EDT, Friday, March 27 (March 28, Kazakh time). As the one-year crew, Kelly and Kornienko will return to Earth on the Soyuz TMA-18M in March 2016. This knowledge from the one-year mission is critical as NASA looks toward human journeys deeper into the solar system, including to and from Mars, which could last 500 days or longer. Image Credit: NASA/Bill Ingalls #nasa #iss #spacestation #space #yearinspace #journeytomars #soyuz #science; -
Fierce black hole "wind" linked to galactic clearing of star-making gas: By combining observations from the Japan-led Suzaku X-ray satellite and the European Space Agency's infrared Herschel Space Observatory, scientists have connected a fierce "wind" produced near a galaxy's monster black hole to an outward torrent of cold gas a thousand light-years across. The finding validates a long-suspected feedback mechanism enabling a supermassive black hole to influence the evolution of its host galaxy. This artist's rendering shows a galaxy being cleared of interstellar gas, the building blocks of new stars. New X-ray observations by Suzaku have identified a wind emanating from the black hole's accretion disk that ultimately drives such outflows. Image Credit: ESA/ATG Medialab; -
Astronaut Terry Virts (@astro_terry) this image from the International Space Station (@ISS) and wrote, "In honor of my friend and fellow fighter pilot "Divot." From above "the surly bonds of earth..." Commander Virts and Flight Engineers Samantha Cristoforetti and Anton Shkaplerov have been in space for 120 days. Monday, Virts and Cristoforetti participated in their 120 day medical tests. The commander conducted a vision test and measurements for the Ocular Health experiment. Cristoforetti collected blood and urine samples for her Biochemical Profile and Bone and Muscle Check. Shkaplerov worked on his set of Russian science experiments. Image Credit: NASA #nasa #iss #space #spacestation #earth #astronauts; -
This view from our Mars Exploration Rover Opportunity shows part of "Marathon Valley," a destination on the western rim of Endeavour Crater, as seen from an overlook north of the valley. The scene spans from east, at left, to southeast. It combines four pointings of the rover's panoramic camera (Pancam) on March 13, 2015, during the 3,958th Martian day, or sol, of Opportunity's work on Mars. The rover team selected Marathon Valley as a science destination because observations yielded evidence of clay minerals, a clue to ancient wet environments. By the time Opportunity explores Marathon Valley, the rover will have exceeded a total driving distance equivalent to an Olympic marathon. Opportunity has been exploring the Meridiani Planum region of Mars since January 2004. Image Credit: NASA #mars #opportunityrover #nasa #martian #journeytomars #science @NASAJPL;
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Aboard the International Space Station, astronaut Terry Virts posted this image and wrote, 'The first hours of the new moon.' Image Credit: NASA #iss #nasa #space #spacestation #moon #earth #astronauts; -
Our Terra Satellite Sees Shadows of Solar Eclipse During the morning of March 20, 2015, a total solar eclipse was visible from parts of Europe, and a partial solar eclipse from northern Africa and northern Asia. NASA's Terra satellite passed over the Arctic Ocean on March 20 at 10:45 UTC (6:45 a.m. EDT) and captured the eclipse's shadow over the clouds in the Arctic Ocean. Image Credit: NASA Goddard MODIS Rapid Response Team; -
Solar Eclipse from Space: Aboard the International Space Station, European Space Agency (ESA) astronaut Samantha Cristoforetti peeked out between experiments and caught this amazing view of the solar eclipse! A solar eclipse occurs when the moon passes between Earth and the sun, casting a shadow over Earth. The moon's shadow masks the solar surface and blocks sunlight from reaching Earth directly - but the amount of sunlight blocked depends on location. For example, on March 20, those in Glasgow, Scotland, saw about 94-percent of the sun blocked by the moon. The unblocked sunlight will appear as a thumbnail sliver. In Paris, the moon blocked about three-quarters of the sun at the time of maximum eclipse. Credit: ESA/NASA #eclipse2015 #SolarEclipse #esa #nasa #iss #space #spacestation #eclipse #solareclipse2015 #earth #moon; -
Arctic sea ice has reached its peak winter extent for the year, and it’s the lowest winter maximum on record. The sea ice cap of the Arctic appeared to reach its annual maximum winter extent on Feb. 25, according to data from the NASA-supported National Snow and Ice Data Center (NSIDC) at the University of Colorado, Boulder. At 5.61 million square miles (14.54 million square kilometers), this year’s maximum extent was the smallest on the satellite record and also one of the earliest. Credit: NASA's Goddard Space Flight Center/J. Beck; -
A strong flare erupted into space from an active region that was roughly facing towards Earth on Mar. 11, 2015. X-class flares are rather uncommon. The bright flash of the flare was followed by streams of dark ejecta that move across the sun to the left. The flare did cause some radio blackouts on Earth when it disturbed our ionosphere. The flare was also associated with a coronal mass ejection. The video clip covers about 2.5 hours. Credit: NASA/SDO;
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Happy Saint Patrick's Day! This gorgeous view of the aurora (above) was taken from the International Space Station as it crossed over the southern Indian Ocean on Sept. 17, 2011. While aurora are often seen near the poles, this aurora appeared at lower latitudes due to a geomagnetic storm - the insertion of energy into Earth's magnetic environment called the magnetosphere - caused by a coronal mass ejection (CME) from the sun that erupted As solar particles from an incoming CME move into Earth's magnetosphere they travel around to its back side - or night side, since it is on the opposite side from the sun - along the magnetic field lines. When these magnetic field lines reconnect in an area known as the magnetotail, energy is released and it sends the particles down onto Earth's poles, and sometimes even lower latitudes. As the particles bombard oxygen and nitrogen in the upper atmosphere, the atoms release a photon of light that we see as the beautiful colors of the aurora. Image Credit: NASA #StPatricksDay #HappySaintPatricksDay #nasa #green #nasa #aurora #iss #spacestation #space #science; -
"Mini Supernova" Explosion Could Have Big Impact: In Hollywood blockbusters, explosions are often among the stars of the show. In space, explosions of actual stars are a focus for scientists who hope to better understand their births, lives, and deaths and how they interact with their surroundings. Using our Chandra X-ray Observatory, astronomers have studied one particular explosion that may provide clues to the dynamics of other, much larger stellar eruptions. Astronomers cite GK Persei as an example of a “classical nova,” an outburst produced by a thermonuclear explosion on the surface of a white dwarf star, the dense remnant of a Sun-like star. This new image of GK Persei contains X-rays from Chandra (blue), optical data from NASA’s Hubble Space Telescope (yellow), and radio data from the National Science Foundation’s Very Large Array (pink). Image Credit: NASA/CXC/RIKEN/D.Takei et al #nasa #chandra #hubble #space #astronomy #telescope #hst #science; -
Groovy Rings at Saturn! From afar, Saturn's rings look like a solid, homogenous disk of material. But upon closer examination from Cassini, we see that there are varied structures in the rings at almost every scale imaginable. Structures in the rings can be caused by many things, but often times Saturn's many moons are the culprits. The dark gaps near the left edge of the A ring (the broad, outermost ring here) are caused by the moons (Pan and Daphnis) embedded in the gaps, while the wider Cassini division (dark area between the B ring and A ring here) is created by a resonance with the medium-sized moon Mimas (which orbits well outside the rings). Prometheusis seen orbiting just outside the A ring in the lower left quadrant of thisimage; the F ring can be faintly seen to the left of Prometheus. Credit: NASA/JPL-Caltech/Space Science Institute #nasa #saturn #space #cassini #science; -
Explores the Mysteries of a Galaxy: The galaxy UGC 8201, captured here by the Hubble Space Telescope, is a dwarf irregular galaxy, so called because of its small size and chaotic structure. It lies just under 15 million light-years away from us in the constellation of Draco (the Dragon). As with most dwarf galaxies it is a member of a larger group of galaxies. In this case UCG 8201 is part of the M81 galaxy group; this group is one of the closest neighbors to the Local Group of galaxies, which contains our galaxy, the Milky Way. The galaxy is at an important phase in its evolution. It has recently finished a long period of star formation, which had significant impact on the whole galaxy. This episode lasted for several hundred million years and produced a high number of newborn bright stars. These stars can be seen in this image as the dominating light source within the galaxy. This process also changed the distribution and amount of dust and gas in between the stars in the galaxy. Credit: ESA/NASA #nasa #hubble #hst #hubble25 #space #galaxy #astronomy #science; -
The United Launch Alliance Atlas V rocket with our Magnetospheric Multiscale (MMS) spacecraft onboard launches from the Cape Canaveral Air Force Station Space Launch Complex 41, Thursday, March 12, 2015, Florida. Our mission studies the mystery of how magnetic fields around Earth connect and disconnect, explosively releasing energy via a process known as magnetic reconnection. MMS consists of four identical spacecraft that work together to provide the first three-dimensional view of this fundamental process, which occurs throughout the universe. Image Credit: NASA/Aubrey Gemignani #nasa #space #mms #science #magrecon #earthrightnow #sun #launch #ula #atlasv;
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