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The Hubble Space Telescope is one of the most powerful scientific instruments ever conceived. Hubble’s most important discoveries have provided answers to questions that astronomers did not yet know how to ask, and found objects that were not yet imagined. Kate Whitaker, NASA Postdoctoral Program Fellow, talks about one of Hubble’s greatest achievements. #Hubble25; -
Since launching 25 years ago this month, Hubble has reinvigorated and reshaped our perception of the cosmos and uncovered a universe where almost anything seems possible within the laws of physics. Amber Straughn, Astrophysicist at Goddard Space Flight Center, talks about her favorite Hubble image. #Hubble25; -
Hubble celebrates its 25th Anniversary on April 24! Dr. John Grunsfeld, Astronaut and Assistant Administrator of NASA’s Science Mission Directorate, speaks on Hubble’s success, thanks to teamwork. #Hubble25; -
Happy Birthday Hubble! This weekend, we’re celebrating some of the stories behind 25 years of the Hubble Space Telescope. The telescope is credited with discovering many distant galaxies, confirming the existence of supermassive black holes in galactic centers, and discovering birthplaces of stars, relaying images almost too mind-boggling to comprehend. NASA Administrator Charlie Bolden piloted the space shuttle Discovery that brought Hubble into orbit 25 years ago. #Hubble25; -
Stares into the Crammed Center of Star Cluster: This image shows the center of the globular cluster Messier 22, also known as M22, as observed by the Hubble Space Telescope. Globular clusters are spherical collections of densely packed stars, relics of the early years of the Universe, with ages of typically 12 to 13 billion years. This is very old considering that the Universe is only 13.8 billion years old. Messier 22 is one of about 150 globular clusters in the Milky Way and at just 10,000 light-years away it is also one of the closest to Earth. It was discovered in 1665 by Abraham Ihle, making it one of the first globulars ever to be discovered. This is not so surprising as it is one of the brightest globular clusters visible from the northern hemisphere, located in the constellation of Sagittarius, close to the Galactic Bulge — the dense mass of stars at the center of the Milky Way. Credit: ESA/Hubble and NASA #nasa #hubble #hst #hubble25 #astronomy #galaxy #stars #science;
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Our Sun Came Late to the Milky Way's Star-Birth Party: Artist's view of night sky from a hypothetical planet within a young Milky Way-like galaxy 10 billion years ago, the sky are ablaze with star birth. Pink clouds of gas harbor newborn stars, and bluish-white, young star clusters litter the landscape. In one of the most comprehensive multi-observatory galaxy surveys yet, astronomers find that galaxies like our Milky Way underwent a stellar "baby boom," churning out stars at a prodigious rate, about 30 times faster than today. Our sun, however, is a late "boomer." The Milky Way's star-birthing frenzy peaked 10 billion years ago, but our sun was late for the party, not forming until roughly 5 billion years ago. By that time the star formation rate in our galaxy had plunged to a trickle. Image Credit: NASA/ESA/Z. Levay (STScI) (artist pic) #nasa #milkyway #space #esa #galaxy #hubble #sun #hubble25 #science; -
Sun Seasons: Our sun is constantly changing. It goes through cycles of activity - swinging between times of relative calm and times when frequent explosions on its surface can fling light, particles and energy out into space. This activity cycle peaks approximately every 11 years. New research shows evidence of a shorter time cycle as well, with activity waxing and waning over the course of about 330 days. Understanding when to expect such bursts of solar activity is crucial to successfully forecast the sun's eruptions, which can drive solar storms at Earth. These space weather events can interfere with satellite electronics, GPS navigation, and radio communications. The quasi-annual variations in space weather seem to be driven by changes in bands of strong magnetic field that are present in each solar hemisphere, Image Credit: NASA #sun #nasa #solar #solarstorm #science #space; -
The artist's concept depicts Kepler-186f , the first validated Earth-size planet to orbit a distant star in the habitable zone-a range of distance from a star where liquid water might pool on the planet's surface. The discovery from April 2014 of Kepler-186f confirms that Earth-size planets exist in the habitable zones of other stars and signals a significant step closer to finding a world similar to Earth. Kepler-186f orbits its star once every 130 days and receives one-third the energy that Earth does from the sun, placing it near the outer edge of the habitable zone. If you could stand on the surface of Kepler-186f, the brightness of its star at high noon would appear as bright as our sun is about an hour before sunset on Earth. Kepler-186f resides in the Kepler-186 system about 500 light-years from Earth in the constellation Cygnus. The system is also home to four inner planets, seen lined up in orbit around a host star that is half the size and mass of the sun. Image Credit: NASA Ames/SETI Institute/JPL-Caltech #nasa #nasabeyond #exoplanet #space #kepler #science; -
Fresh Tiger Stripes on Enceladus: Do underground oceans vent through the tiger stripes (in false-color blue) on Saturn's moon Enceladus? The long features dubbed tiger stripes are known to spew ice from the moon's icy interior into space, creating a cloud of fine ice particles over the moon's south pole and creating Saturn's mysterious E-ring. Why #Enceladus is active remains a mystery, as the neighboring moon Mimas, approximately the same size, appears to be quite dead. An analysis of dust captured by Cassini found evidence for sodium as expected in a deep salty ocean. Such research is particularly interesting since such an ocean would be a candidate to contain life. Conversely however, recent Earth-based observations of ice ejected by Enceladus into Saturn's E-Ring showed no evidence of the expected sodium. Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA Picture from June 2009 is a high resolution Cassini image of Enceladus from a close flyby #nasa #cassini #space #moons #water #nasabeyond#solarsystem #science #astronomy; -
Searching for Water in the Solar System and Beyond: As our missions explore our solar system and search for new worlds, they are finding water in surprising places. Water is but one piece of our search for habitable planets and life beyond Earth, yet it links many seemingly unrelated worlds in surprising ways. In this artist's concept, the moon #Ganymede orbits the giant planet Jupiter. The Hubble Space Telescope observed aurorae on the moon generated by Ganymede's magnetic fields. A saline ocean under the moon's icy crust best explains shifting in the auroral belts measured by Hubble. Image Credit: NASA/ESA #nasa #space #nasabeyond #astronomy #hubble #hst #science #jupiter;
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From the International Space Station, NASA astronaut Scott Kelly (@stationcdrkelly on Instagram) took this photograph and posted it to social media on April 6, 2015. Kelly wrote, "Australia. You are very beautiful. Thank you for being there to brighten our day. #YearInSpace" Kelly and Russian Federal Space Agency (Roscosmos) cosmonaut Mikhail Kornienko began their one-year mission aboard the space station on March 27. 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. Image Credit: NASA #nasa #iss #spacestation #isscrew #astronauts; -
This Earth Day, April 22, we're asking you to share pictures and video of your favorite places on Earth using social media – and tag them #NoPlaceLikeHome. At NASA, we explore lots of planets and there’s a lot to love: the mountains on Mars, the rings of Saturn, the 99.77-degree axial tilt of Uranus. Our scientists from around the world have now discovered more than 1,800 planets beyond our solar system. But how about a little something for the home team? It’s Earth Day. Let’s explore our home planet, too. For more information, visit: http://www.nasa.gov/likehome #earth #earthday #nasa #science; -
Aboard the International Space Station, astronaut Terry Virts posted this image and wrote, "Happy Easter." Image Credit: NASA #nasa #space #iss #spacestation #earth @astro_terry; -
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;
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