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Hubble View of a Cosmological Measuring Tape This Hubble Space Telescope image shows the spiral galaxy NGC 3021 which lies about 100 million light-years away in the constellation of Leo Minor, the Little Lion. Among many other types of stars, this galaxy contains Cepheid variable stars, which can be used work out the distance to the galaxy. These stars pulsate at a rate that is closely related to their intrinsic brightness, so measurements of their rate of pulsation and their observed brightness give astronomers enough information to calculate the distance to the galaxy itself. Cepheids are also used to calibrate an even brighter distance marker that can be used over greater distances: Type Ia supernovae. One of these bright exploding stars was observed in NGC 3021, back in 1995. In addition, the supernova in NGC 3021 was also used to refine the measurement of what is known as the Hubble constant. The value of this constant defines how fast the Universe is expanding and the more accurately we know it the more we can understand about the evolution of the Universe in the past as well as in the future. So, there is much more to this galaxy than just a pretty spiral. Credit: NASA & ESA. Acknowledgement: A. Riess, STScI #nasa #hubble #hubble25 #hst #galaxies #galaxy #space #science #stars; -
Set your alarm! On Saturday morning, April 4, 2015, not long before sunrise on the East Coast, the bright full moon over North America should turn a lovely shade of celestial red during a total lunar eclipse. The lunar eclipse will be visible from all parts of the United States. Eastern North America and western South America can see beginning stages of the partial umbral eclipse low in the west before sunrise April 4, whereas middle Asia (India, western China, mid-Asian Russia) can view the ending stages of the partial umbral eclipse low in the east after sunset April 4. Greenland, Iceland, Europe, Africa and the Middle East won't see this eclipse at all. The total eclipse will last only five minutes. From 6 - 8 a.m. EDT, NASA TV will offer live video and NASA astronomer Mitzi Adams will take Twitter questions via @NASA_Marshall on Twitter. Use the hashtag #eclipse2015 to send your questions. #nasa #eclipse #lunareclipse #bloodmoon #space #moon #astronomy #science; -
Phantom Objects Near Dead Quasars: Our Hubble Space Telescope has photographed a set of wispy, goblin-green objects that are the ephemeral ghosts of quasars that flickered to life and then faded. This image is one from the set of bizarre, looping, spiral, and braided shapes around eight active galaxies. The galaxies host a bright quasar that may have illuminated the structures. Image Credit: NASA, ESA, and W. Keel (University of Alabama, Tuscaloosa) #nasa #hubble #hubble25 #hst #galaxies #galaxy #quasar #space #science; -
Space Station Flies Over Super Typhoon Maysak: Typhoon Maysak strengthened into a super typhoon on March 31, reaching Category 5 hurricane status on the Saffir-Simpson Wind Scale. NASA Astronaut Terry Virts captured this image while flying over the weather system on board the International Space Station. Commenting on the storm, Virts wrote, "The eye of #Maysak typhoon really stands out early in the morning with the shadow being cast deep into the vortex." His ESA crewmate on station also viewed the storm and wrote, "Commands respect even from #space: we just flew over typhoon #Maysak." Image Credit: NASA #nasa #iss #space #typhoon #weather #hurricane #astronauts #spacestation; -
Hedgerow Prominence Erupts: A tangled mass of plasma strands rose up above the sun in an arch, then quickly fell apart as it broke away into space (Mar. 26-27, 2015). These densely structured prominences, usually unstable, are suspended above the sun by magnetic forces. Here they are imaged in a wavelength of extreme ultraviolet light. Amateur astronomers worldwide have been having a wonderful time watching this event unfold. Image Credit: Solar Dynamics Observatory, NASA #nasa #sun #space #sdo #solar #astronomy #science;
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Media photograph the Soyuz TMA-16M spacecraft as it launched to the International Space Station (@ISS) with Expedition 43 NASA Astronaut Scott Kelly (@stationcdrkelly), Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) onboard Saturday, March 28, 2015, Kazakh time (March 27 Eastern time) from the Baikonur Cosmodrome in Kazakhstan. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Image Credit: NASA/Bill Ingalls #nasa #yearinspace #iss #spacestation #astronauts; -
An edge-on view of the spiral galaxy NGC 5023, which lies over 30 million light-years away from us. Due to its orientation seen here by our Hubble Space Telescope, we cannot appreciate its spiral arms, but we can admire the elegant profile of its disk. Astronomers are particularly interested in the vertical structure of disks like these to help understand galaxy evolution. The incredible sharp sight of Hubble has allowed scientist to count more than 30,000 individual bright stars in this image. This is only a small fraction of the several billion stars that this galaxy contains, but the others are too faint to detect individually even with Hubble. Credit: ESA/NASA #nasa #hubble #hubble25 #hst #telescope #space #astronomy #science; -
And Lift Off! At 3:42 p.m. EDT, NASA astronaut Scott Kelly and Russian cosmonauts Mikhail Kornienko and Gennady Padalka launched aboard a Soyuz spacecraft to the International Space Station. Kelly and Kornienko will begin 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 NASA looks toward human journeys deeper into the solar system, including to and from Mars, which could last 500 days or longer. It also carries potential benefits for humans here on Earth, from helping patients recover from long periods of bed rest to improving monitoring for people whose bodies are unable to fight infections. Image Credit: NASA/Bill Ingalls #nasa #yearinspace #space #iss #spacestation #journeytomars #science; -
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;
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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; -
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;
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