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In case you missed it, it has been a decade since a robotic traveler from Earth first soared over rings of ice and fired its engine to fall forever into the embrace of Saturn. On June 30, the Cassini mission celebrated 10 years of exploring the planet, its rings and moons. A mosaic of nine processed images recently acquired during Cassini's first very close flyby of Saturn's moon Titan on Oct. 26, 2004, constitutes the most detailed full-disc view of the mysterious moon. The images that comprise this mosaic have been processed to reduce the effects of the atmosphere and to sharpen surface features. The mosaic has been trimmed to show only the illuminated surface and not the atmosphere above the edge of the moon. The Sun was behind Cassini so nearly the full disc is illuminated. Pixels scales of the composite images vary from 2 to 4 kilometers per pixel (1.2 to 2.5 miles per pixel). Surface features are best seen near the center of the disc, where the spacecraft is looking directly downwards; the contrast becomes progressively lower and surface features become fuzzier towards the outside, where the spacecraft is peering through haze, a circumstance that washes out surface features. The brighter region on the right side and equatorial region is named Xanadu Regio. Scientists are actively debating what processes may have created the bizarre surface brightness patterns seen here. The images hint at a young surface with, no obvious craters. However, the exact nature of that activity, whether tectonic, wind-blown, fluvial, marine, or volcanic is still to be determined. Credit: NASA/JPL/SSI #Cassini10 #NASA #space#saturn #solarsystem #cassini; -
In case you missed it, it has been a decade since a robotic traveler from Earth first soared over rings of ice and fired its engine to fall forever into the embrace of Saturn. On June 30, the Cassini mission celebrated 10 years of exploring the planet, its rings and moons. On July 19, 2013, in an event celebrated the world over, NASA's Cassini spacecraft slipped into Saturn's shadow and turned to image the planet, seven of its moons, its inner rings -- and, in the background, our home planet, Earth. With the sun's powerful and potentially damaging rays eclipsed by Saturn itself, Cassini's onboard cameras were able to take advantage of this unique viewing geometry. They acquired a panoramic mosaic of the Saturn system that allows scientists to see details in the rings and throughout the system as they are backlit by the sun. This mosaic is special as it marks the third time our home planet was imaged from the outer solar system; the second time it was imaged by Cassini from Saturn's orbit; and the first time ever that inhabitants of Earth were made aware in advance that their photo would be taken from such a great distance. Credit: NASA/JPL #Cassini10 #NASA #space#saturn #solarsystem #cassini; -
In case you missed it, it has been a decade since a robotic traveler from Earth first soared over rings of ice and fired its engine to fall forever into the embrace of Saturn. On June 30, the Cassini mission celebrated 10 years of exploring the planet, its rings and moons. Specially designed Cassini orbits place Earth and Cassini on opposite sides of Saturn's rings, a geometry known as occultation. Cassini conducted the first radio occultation observation of Saturn's rings on May 3, 2005, seen here. Three simultaneous radio signals of 0.94, 3.6, and 13 centimeter wavelength (Ka-, X-, and S-bands) were sent from Cassini through the rings to Earth. The observed change of each signal as Cassini moved behind the rings provided a profile of the distribution of ring material as a function of distance from Saturn, or an optical depth profile. This simulated image was constructed from the measured optical depth profiles. It depicts the observed ring structure at about 10 kilometers (6 miles) in resolution. Color is used to represent information about ring particle sizes in different regions based on the measured effects of the three radio signals. Purple color indicates regions where there is a lack of particles of size less than 5 centimeters (about 2 inches). Green and blue shades indicate regions where there are particles smaller than 5 centimeters (2 inches) and 1 centimeter (less than one third of one inch). The saturated broad white band near the middle of ring B is the densest region of ring B, over which two of the three radio signals were blocked at 10-kilometer (6-mile) resolution, preventing accurate color representation over this band. From other evidence in the radio observations, all ring regions appear to be populated by a broad range particle size distribution that extends to boulder sizes (several to many meters across). Credit: NASA/JPL #Cassini10 #NASA #space#saturn #solarsystem #cassini; -
Celestial Fireworks: Like an Independence Day fireworks display, a young, glittering collection of stars looks like an aerial burst. The cluster is surrounded by clouds of interstellar gas and dust -- the raw material for new star formation. The nebula, located 20,000 light-years away in the constellation Carina, contains a central cluster of huge, hot stars, called NGC 3603. This environment is not as peaceful as it looks. Ultraviolet radiation and violent stellar winds have blown out an enormous cavity in the gas and dust enveloping the cluster, providing an unobstructed view of the cluster. Image Credit: NASA, ESA, R. O'Connell (University of Virginia), F. Paresce (National Institute for Astrophysics, Bologna, Italy), E. Young (Universities Space Research Association/Ames Research Center), the WFC3 Science Oversight Committee, and the Hubble Heritage Team (STScI/AURA) #independenceday #4thofjuly #july4th #nasa #space #science #fourthofjuly #4thofjuly2014; -
Stellar Fireworks! Resembling an aerial fireworks explosion, this dramatic image of the energetic star WR124, taken by the Hubble Space Telescope, reveals that it is surrounded by hot clumps of gas being ejected into space at speeds of over 100,000 miles per hour. The picture was taken in March 1997. The image is false-colored to reveal details in the nebula's structure. Image credit: NASA/Yves Grosdidier (University of Montreal and Observatoire de Strasbourg), Anthony Moffat (Universitie de Montreal), Gilles Joncas (Universite Laval), Agnes Acker (Observatoire de Strasbourg) #independenceday #4thofjuly #july4th #star #nasa #space #science #fourthofjuly #4thofjuly2014;
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A Spaceborne Perspective on the Red, White and Blue: Philadelphia, where the Declaration of Independence was signed on July 4, 1776, lies in the center of this image from our Multi-angle Imaging SpectroRadiometer (MISR). This true-color view of the northeastern United States, taken from the instrument's nadir, or downward-looking, camera includes a fitting display of the reddish colors of soils, grayish-whites of urban areas and clouds, and blue hues of water. This image was acquired on October 11, 2000, during Terra orbit 4344. It covers an area 334 kilometers x 328 kilometers. North is at the top. NASA/GSFC/LaRC/JPL, MISR Team #independenceday #4thofjuly #july4th #nasa #space #science #fourthofjuly #4thofjuly2014; -
A Spaceborne Perspective on the Red, White and Blue: Philadelphia, where the Declaration of Independence was signed on July 4, 1776, lies in the center of this image from our Multi-angle Imaging SpectroRadiometer (MISR). This true-color view of the northeastern United States, taken from the instrument's nadir, or downward-looking, camera includes a fitting display of the reddish colors of soils, grayish-whites of urban areas and clouds, and blue hues of water. This image was acquired on October 11, 2000, during Terra orbit 4344. It covers an area 334 kilometers x 328 kilometers. North is at the top. NASA/GSFC/LaRC/JPL, MISR Team #independenceday #4thofjuly #july4th #nasa #space #science #fourthofjuly #4thofjuly2014; -
Extraterrestrial Fireworks on this Independence Day! Reminiscent of a fireworks celebration, this Hubble Space Telescope image of a cosmic explosion that is quite similar to fireworks on Earth. In the upper right corner of the image, the Small Magellanic Cloud is a delicate glowing structure ablaze in a multitude of lavenders and peach. Nearby, a massive star has exploded as a supernova and begun to dissipate its interior into a spectacular display of colorful filaments. Determined to be only about 2,000 years old, young supernova remnants like this allow astronomers to examine material from the cores of massive stars directly. This in turn gives insight on how stars form, their composition and the chemical enrichment of the surrounding area. As well, young remnants are a great learning tool to better understand the physics of supernova explosions. The Small Magellanic Cloud is a nearby dwarf galaxy to our own Milky Way. It is visible in the Southern Hemisphere, in the direction of the constellation Tucana, and lies roughly 210,000 light-years distant. Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)/J. Green (University of Colorado, Boulder) #independenceday #4thofjuly #july4th #supernova #nasa #space #science #fourthofjuly #4thofjuly2014; -
Celestial Fireworks! Resembling the puffs of smoke and sparks from Independence Day fireworks display, this Hubble image depicts the delicate filaments debris from a stellar explosion in a neighboring galaxy. Denoted N 49, or DEM L 190, this remnant is from a massive star that died in a supernova blast whose light would have reached Earth thousands of years ago. This filamentary material will eventually be recycled into building new generations of stars. Our own sun and planets are constructed from similar debris of supernovae that exploded in the Milky Way billions of years ago. Image Credit: Image Credit: NASA, The Hubble Heritage Team (STScI/AURA), Y.-H. Chu (UIUC), S. Kulkarni (Caltech) and R. Rothschild (UCSD) #independenceday #4thofjuly #july4th #galaxy #nasa #space #science #fourthofjuly #4thofjuly2014; -
The 'Fireworks Galaxy' - NGC 6946 is a medium-sized, face-on spiral galaxy about 22 million light years away from Earth. In the past century, eight supernovas have been observed to explode in the arms of this galaxy. Chandra observations (purple) have, in fact, revealed three of the oldest supernovas ever detected in X-rays, giving more credence to its nickname of the "Fireworks Galaxy." This composite image also includes optical data from the Gemini Observatory in red, yellow, and cyan. Image credit: X-ray: NASA/CXC/MSSL/R.Soria et al, Optical: AURA/Gemini OBs #independenceday #4thofjuly #july4th #galaxy #nasa #space #science #fourthofjuly #4thofjuly2014;
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Happy Independence Day! Here's a red, white and blue image of Earth. Our Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) spacecraft zipped around Earth, getting an orbit correction from Earth's gravity and getting a chance to test its instruments by observing its home planet. The wide-angle camera records light at eleven different wavelengths, including visible and infrared light. Combining blue, red, and green light results in a true-color image from the observations. The image substitutes infrared light for blue light in the three-band combination. The resulting image is crisper than the natural color version because our atmosphere scatters blue light. Infrared light, however, passes through the atmosphere with relatively little scattering and allows a clearer view. That wavelength substitution makes plants appear red. Why? Plants reflect near-infrared light more strongly than either red or green, and in this band combination, near-infrared is assigned to look red. Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington #independenceday #4thofjuly #july4th #earth #nasa #space #science #mercury #4thofjuly2014; -
Red, white and blue from the International Space Station to you! Astronauts aboard the space station captured this photo of Earth's atmospheric layers on July 31, 2011, revealing the troposphere (orange-red), stratosphere and above. Satellite instruments allow scientists to better understand the chemistry and dynamics occurring within and between these layers. Image Credit: NASA/JSC Gateway to Astronaut Photography of Earth #independenceday #4thofjuly #july4th #iss #nasa #space #science #fourthofjuly #4thofjuly2014; -
Fireworks! Celebrants this Fourth of July will enjoy the dazzling lights and booming shock waves from the explosions of fireworks. A similarly styled event is taking place in the galaxy Messier 106. Energetic jets, which blast from Messier 106's central black hole, are heating up material in the galaxy and thus making it glow, like the ingredients in a firework. The jets also power shock waves that are driving gases out of the galaxy's interior. A galaxy about 23 million light years away is the site of this impressive, ongoing fireworks. Rather than paper, powder and fire, this galactic light show involves a giant black hole, shock waves and vast reservoirs of gas. This galactic fireworks display is taking place in NGC 4258, also known as M106, a spiral galaxy like the Milky Way. This galaxy is famous, however, for something that our galaxy doesn't have - two extra spiral arms that glow in X-ray, optical and radio light. These features, or anomalous arms, are not aligned with the plane of the galaxy, but instead intersect with it. Image Credit: X-ray: NASA/CXC/Caltech/P.Ogle et al; Optical: NASA/STScI; IR: NASA/JPL-Caltech; Radio: NSF/NRAO/VLA #independenceday #4thofjuly #july4th #galaxy #nasa #space #science #fourthofjuly #4thofjuly2014; -
Infrared View of a Comet and Distant Galaxy: Our NEOWISE mission captured this series of pictures of comet C/2012 K1 -- also known as comet Pan-STARRS -- as it swept across our skies on May 20, 2014. The comet is relatively close to us -- it was only about 143 million miles (230 million kilometers) from Earth when this picture was taken. It is seen passing a much more distant spiral galaxy, called NGC 3726, which is about 55 million light-years from Earth, or 2 trillion times farther away than the comet. Image credit: NASA/JPL-Caltech #nasa #galaxy #comet #astronomy #space #science; -
Tropical Storm Arthur churns in the Atlantic: The storm's center was east of Florida's northeast coast. By 5 a.m. EDT on July 3, Arthur's eye had formed but remained cloud covered even as the storm hit hurricane-strength with maximum sustained winds near 75 mph. This visible image of Tropical Storm Arthur was taken by the MODIS instrument aboard NASA's Aqua satellite on July 2 at 18:50 UTC (2:50 p.m. EDT). A cloud-covered eye is clearly visible. Image Credit: NASA Goddard MODIS Rapid Response Team #nasa #iss #spacestation #space #arthur #tsarthur #weather #climate #nhc #nws;
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